23557997 has 2 divisors, whose sum is σ = 23557998. Its totient is φ = 23557996.

The previous prime is 23557987. The next prime is 23558027. The reversal of 23557997 is 79975532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22005481 + 1552516 = 4691^2 + 1246^2 .

It is a cyclic number.

It is not a de Polignac number, because 23557997 - 2⁴ = 23557981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23557907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11778998 + 11778999.

It is an arithmetic number, because the mean of its divisors is an integer number (11778999).

Almost surely, 2^23557997 is an apocalyptic number.

It is an amenable number.

23557997 is a deficient number, since it is larger than the sum of its proper divisors (1).

23557997 is an equidigital number, since it uses as much as digits as its factorization.

23557997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 595350, while the sum is 47.

The square root of 23557997 is about 4853.6581049761. The cubic root of 23557997 is about 286.6681568037.

The spelling of 23557997 in words is "twenty-three million, five hundred fifty-seven thousand, nine hundred ninety-seven".