23501557 has 2 divisors, whose sum is σ = 23501558. Its totient is φ = 23501556.

The previous prime is 23501539. The next prime is 23501563. The reversal of 23501557 is 75510532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18054001 + 5447556 = 4249^2 + 2334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23501557 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 (23501507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11750778 + 11750779.

It is an arithmetic number, because the mean of its divisors is an integer number (11750779).

Almost surely, 2^23501557 is an apocalyptic number.

It is an amenable number.

23501557 is a deficient number, since it is larger than the sum of its proper divisors (1).

23501557 is an equidigital number, since it uses as much as digits as its factorization.

23501557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 23501557 is about 4847.8404470444. The cubic root of 23501557 is about 286.4390415564.

The spelling of 23501557 in words is "twenty-three million, five hundred one thousand, five hundred fifty-seven".