23131537 has 24 divisors (see below), whose sum is σ = 28565568. Its totient is φ = 18532800.

The previous prime is 23131523. The next prime is 23131547. The reversal of 23131537 is 73513132.

It is not a de Polignac number, because 23131537 - 2¹¹ = 23129489 is a prime.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23131517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42487 + ... + 43027.

It is an arithmetic number, because the mean of its divisors is an integer number (1190232).

Almost surely, 2^23131537 is an apocalyptic number.

It is an amenable number.

23131537 is a deficient number, since it is larger than the sum of its proper divisors (5434031).

23131537 is a wasteful number, since it uses less digits than its factorization.

23131537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 588 counting only the distinct ones).

The product of its digits is 1890, while the sum is 25.

The square root of 23131537 is about 4809.5256522863. The cubic root of 23131537 is about 284.9278036066.

Adding to 23131537 its reverse (73513132), we get a palindrome (96644669).

The spelling of 23131537 in words is "twenty-three million, one hundred thirty-one thousand, five hundred thirty-seven".