23621657 has 2 divisors, whose sum is σ = 23621658. Its totient is φ = 23621656.

The previous prime is 23621639. The next prime is 23621669. The reversal of 23621657 is 75612632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736281 + 6885376 = 4091^2 + 2624^2 .

It is a cyclic number.

It is not a de Polignac number, because 23621657 - 2¹⁴ = 23605273 is a prime.

It is not a weakly prime, because it can be changed into another prime (23621957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11810828 + 11810829.

It is an arithmetic number, because the mean of its divisors is an integer number (11810829).

Almost surely, 2^23621657 is an apocalyptic number.

It is an amenable number.

23621657 is a deficient number, since it is larger than the sum of its proper divisors (1).

23621657 is an equidigital number, since it uses as much as digits as its factorization.

23621657 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 23621657 is about 4860.2116209071. The cubic root of 23621657 is about 286.9261425363.

The spelling of 23621657 in words is "twenty-three million, six hundred twenty-one thousand, six hundred fifty-seven".