23381537 has 2 divisors, whose sum is σ = 23381538. Its totient is φ = 23381536.

The previous prime is 23381497. The next prime is 23381563. The reversal of 23381537 is 73518332.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16032016 + 7349521 = 4004^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 23381537 - 2⁶ = 23381473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23381737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11690768 + 11690769.

It is an arithmetic number, because the mean of its divisors is an integer number (11690769).

Almost surely, 2^23381537 is an apocalyptic number.

It is an amenable number.

23381537 is a deficient number, since it is larger than the sum of its proper divisors (1).

23381537 is an equidigital number, since it uses as much as digits as its factorization.

23381537 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 23381537 is about 4835.4458946409. The cubic root of 23381537 is about 285.9506043762.

Adding to 23381537 its reverse (73518332), we get a palindrome (96899869).

The spelling of 23381537 in words is "twenty-three million, three hundred eighty-one thousand, five hundred thirty-seven".