23871521 has 2 divisors, whose sum is σ = 23871522. Its totient is φ = 23871520.

The previous prime is 23871517. The next prime is 23871527. The reversal of 23871521 is 12517832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23814400 + 57121 = 4880^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 23871521 - 2² = 23871517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23871527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11935760 + 11935761.

It is an arithmetic number, because the mean of its divisors is an integer number (11935761).

Almost surely, 2^23871521 is an apocalyptic number.

It is an amenable number.

23871521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23871521 is an equidigital number, since it uses as much as digits as its factorization.

23871521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 29.

The square root of 23871521 is about 4885.8490562030. The cubic root of 23871521 is about 287.9342739997.

The spelling of 23871521 in words is "twenty-three million, eight hundred seventy-one thousand, five hundred twenty-one".