23387531 has 2 divisors, whose sum is σ = 23387532. Its totient is φ = 23387530.

The previous prime is 23387513. The next prime is 23387557. The reversal of 23387531 is 13578332.

Together with previous prime (23387513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23387531 - 2¹⁰ = 23386507 is a prime.

It is a super-2 number, since 2×23387531² = 1093953212551922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23387501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11693765 + 11693766.

It is an arithmetic number, because the mean of its divisors is an integer number (11693766).

Almost surely, 2^23387531 is an apocalyptic number.

23387531 is a deficient number, since it is larger than the sum of its proper divisors (1).

23387531 is an equidigital number, since it uses as much as digits as its factorization.

23387531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 32.

The square root of 23387531 is about 4836.0656529869. The cubic root of 23387531 is about 285.9750373505.

The spelling of 23387531 in words is "twenty-three million, three hundred eighty-seven thousand, five hundred thirty-one".