23557619 has 2 divisors, whose sum is σ = 23557620. Its totient is φ = 23557618.

The previous prime is 23557607. The next prime is 23557621. The reversal of 23557619 is 91675532.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23557619 - 2⁴ = 23557603 is a prime.

It is a super-2 number, since 2×23557619² = 1109922825898322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 23557621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23557519) 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, 11778809 + 11778810.

It is an arithmetic number, because the mean of its divisors is an integer number (11778810).

Almost surely, 2^23557619 is an apocalyptic number.

23557619 is a deficient number, since it is larger than the sum of its proper divisors (1).

23557619 is an equidigital number, since it uses as much as digits as its factorization.

23557619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 38.

The square root of 23557619 is about 4853.6191651179. The cubic root of 23557619 is about 286.6666235503. Note that the first 4 decimals are identical.

The spelling of 23557619 in words is "twenty-three million, five hundred fifty-seven thousand, six hundred nineteen".