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25300031 = 32997669
BaseRepresentation
bin110000010000…
…0110000111111
31202121101010012
41200200300333
522434100111
62302133435
7425022011
oct140406077
952541105
1025300031
1113310319
12858127b
13531a943
1435081b1
15234b48b
hex1820c3f

25300031 has 4 divisors (see below), whose sum is σ = 25311000. Its totient is φ = 25289064.

The previous prime is 25300021. The next prime is 25300049. The reversal of 25300031 is 13000352.

Adding to 25300031 its reverse (13000352), we get a palindrome (38300383).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-25300031 is a prime.

It is a super-2 number, since 2×253000312 = 1280183137201922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25299979 and 25300015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25300021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (6327750).

Almost surely, 225300031 is an apocalyptic number.

25300031 is a deficient number, since it is larger than the sum of its proper divisors (10969).

25300031 is an equidigital number, since it uses as much as digits as its factorization.

25300031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10968.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 25300031 is about 5029.9136175485. The cubic root of 25300031 is about 293.5668533324.

The spelling of 25300031 in words is "twenty-five million, three hundred thousand, thirty-one".

Divisors: 1 3299 7669 25300031