25990031 has 4 divisors (see below), whose sum is σ = 26430600. Its totient is φ = 25549464.

The previous prime is 25990009. The next prime is 25990033. The reversal of 25990031 is 13009952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25990031 - 2¹⁸ = 25727887 is a prime.

It is a super-2 number, since 2×25990031² = 1350963422761922, 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 = 25989976 and 25990003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25990033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220196 + ... + 220313.

It is an arithmetic number, because the mean of its divisors is an integer number (6607650).

Almost surely, 2^25990031 is an apocalyptic number.

25990031 is a deficient number, since it is larger than the sum of its proper divisors (440569).

25990031 is an equidigital number, since it uses as much as digits as its factorization.

25990031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440568.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 25990031 is about 5098.0418789963. The cubic root of 25990031 is about 296.2117390219.

Adding to 25990031 its reverse (13009952), we get a palindrome (38999983).

The spelling of 25990031 in words is "twenty-five million, nine hundred ninety thousand, thirty-one".