25491504931 has 8 divisors (see below), whose sum is σ = 25541326944. Its totient is φ = 25441711680.

The previous prime is 25491504901. The next prime is 25491504949. The reversal of 25491504931 is 13940519452.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25491504931 is a prime.

It is a super-2 number, since 2×25491504931² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25491504901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2724321 + ... + 2733661.

It is an arithmetic number, because the mean of its divisors is an integer number (3192665868).

Almost surely, 2^25491504931 is an apocalyptic number.

25491504931 is a deficient number, since it is larger than the sum of its proper divisors (49822013).

25491504931 is an equidigital number, since it uses as much as digits as its factorization.

25491504931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14381.

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 25491504931 in words is "twenty-five billion, four hundred ninety-one million, five hundred four thousand, nine hundred thirty-one".