23137531 has 4 divisors (see below), whose sum is σ = 23254000. Its totient is φ = 23021064.

The previous prime is 23137529. The next prime is 23137537. The reversal of 23137531 is 13573132.

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 23137531 - 2¹ = 23137529 is a prime.

It is a super-2 number, since 2×23137531² = 1070690681551922, 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 = 23137496 and 23137505.

It is not an unprimeable number, because it can be changed into a prime (23137537) 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, 57936 + ... + 58333.

It is an arithmetic number, because the mean of its divisors is an integer number (5813500).

Almost surely, 2^23137531 is an apocalyptic number.

23137531 is a deficient number, since it is larger than the sum of its proper divisors (116469).

23137531 is a wasteful number, since it uses less digits than its factorization.

23137531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116468.

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

The square root of 23137531 is about 4810.1487502987. The cubic root of 23137531 is about 284.9524122864.

The spelling of 23137531 in words is "twenty-three million, one hundred thirty-seven thousand, five hundred thirty-one".