23131525 has 12 divisors (see below), whose sum is σ = 28970244. Its totient is φ = 18320000.

The previous prime is 23131523. The next prime is 23131547. The reversal of 23131525 is 52513132.

23131525 = T₃₇₄ + T₃₇₅ + ... + T₅₇₅.

It can be written as a sum of positive squares in 6 ways, for example, as 101124 + 23030401 = 318^2 + 4799^2 .

It is not a de Polignac number, because 23131525 - 2¹ = 23131523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131496 and 23131505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23131523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2056 + ... + 7105.

It is an arithmetic number, because the mean of its divisors is an integer number (2414187).

Almost surely, 2^23131525 is an apocalyptic number.

23131525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23131525 is a deficient number, since it is larger than the sum of its proper divisors (5838719).

23131525 is a wasteful number, since it uses less digits than its factorization.

23131525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9272 (or 9267 counting only the distinct ones).

The product of its digits is 900, while the sum is 22.

The square root of 23131525 is about 4809.5244047619. The cubic root of 23131525 is about 284.9277543357.

Adding to 23131525 its reverse (52513132), we get a palindrome (75644657).

It can be divided in two parts, 231315 and 25, that multiplied together give a palindrome (5782875).

The spelling of 23131525 in words is "twenty-three million, one hundred thirty-one thousand, five hundred twenty-five".