23961521 has 2 divisors, whose sum is σ = 23961522. Its totient is φ = 23961520.

The previous prime is 23961503. The next prime is 23961547. The reversal of 23961521 is 12516932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 11458225 = 3536^2 + 3385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23961521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23961571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11980760 + 11980761.

It is an arithmetic number, because the mean of its divisors is an integer number (11980761).

Almost surely, 2^23961521 is an apocalyptic number.

It is an amenable number.

23961521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23961521 is an equidigital number, since it uses as much as digits as its factorization.

23961521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 23961521 is about 4895.0506636806. The cubic root of 23961521 is about 288.2956751543.

The spelling of 23961521 in words is "twenty-three million, nine hundred sixty-one thousand, five hundred twenty-one".