23131520425 has 48 divisors (see below), whose sum is σ = 31847305392. Its totient is φ = 16557465600.

The previous prime is 23131520413. The next prime is 23131520429. The reversal of 23131520425 is 52402513132.

It can be written as a sum of positive squares in 24 ways, for example, as 22855694761 + 275825664 = 151181^2 + 16608^2 .

It is not a de Polignac number, because 23131520425 - 2⁷ = 23131520297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131520393 and 23131520402.

It is not an unprimeable number, because it can be changed into a prime (23131520429) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2086497 + ... + 2097553.

It is an arithmetic number, because the mean of its divisors is an integer number (663485529).

Almost surely, 2^23131520425 is an apocalyptic number.

23131520425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23131520425 is a deficient number, since it is larger than the sum of its proper divisors (8715784967).

23131520425 is a wasteful number, since it uses less digits than its factorization.

23131520425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11278 (or 11273 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 23131520425 in words is "twenty-three billion, one hundred thirty-one million, five hundred twenty thousand, four hundred twenty-five".