23661857 has 2 divisors, whose sum is σ = 23661858. Its totient is φ = 23661856.

The previous prime is 23661811. The next prime is 23661863. The reversal of 23661857 is 75816632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23435281 + 226576 = 4841^2 + 476^2 .

It is a cyclic number.

It is not a de Polignac number, because 23661857 - 2⁸ = 23661601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23661857.

It is not a weakly prime, because it can be changed into another prime (23664857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11830928 + 11830929.

It is an arithmetic number, because the mean of its divisors is an integer number (11830929).

Almost surely, 2^23661857 is an apocalyptic number.

It is an amenable number.

23661857 is a deficient number, since it is larger than the sum of its proper divisors (1).

23661857 is an equidigital number, since it uses as much as digits as its factorization.

23661857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 23661857 is about 4864.3454852632. The cubic root of 23661857 is about 287.0888166155.

The spelling of 23661857 in words is "twenty-three million, six hundred sixty-one thousand, eight hundred fifty-seven".