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25531421 = 191343759
BaseRepresentation
bin110000101100…
…1010000011101
31210001010112012
41201121100131
523014001141
62311121005
7430004426
oct141312035
953033465
1025531421
1113459153
128673165
13539c066
14356864d
152394ceb
hex185941d

25531421 has 4 divisors (see below), whose sum is σ = 26875200. Its totient is φ = 24187644.

The previous prime is 25531409. The next prime is 25531423. The reversal of 25531421 is 12413552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25531421 - 222 = 21337117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25531423) 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, 671861 + ... + 671898.

It is an arithmetic number, because the mean of its divisors is an integer number (6718800).

Almost surely, 225531421 is an apocalyptic number.

It is an amenable number.

25531421 is a deficient number, since it is larger than the sum of its proper divisors (1343779).

25531421 is a wasteful number, since it uses less digits than its factorization.

25531421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1343778.

The product of its digits is 1200, while the sum is 23.

The square root of 25531421 is about 5052.8626539814. The cubic root of 25531421 is about 294.4591103753.

Adding to 25531421 its reverse (12413552), we get a palindrome (37944973).

It can be divided in two parts, 25531 and 421, that added together give a palindrome (25952).

The spelling of 25531421 in words is "twenty-five million, five hundred thirty-one thousand, four hundred twenty-one".

Divisors: 1 19 1343759 25531421