23737561 has 2 divisors, whose sum is σ = 23737562. Its totient is φ = 23737560.

The previous prime is 23737543. The next prime is 23737583. The reversal of 23737561 is 16573732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21678336 + 2059225 = 4656^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 23737561 - 2¹³ = 23729369 is a prime.

It is not a weakly prime, because it can be changed into another prime (23737531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11868780 + 11868781.

It is an arithmetic number, because the mean of its divisors is an integer number (11868781).

Almost surely, 2^23737561 is an apocalyptic number.

It is an amenable number.

23737561 is a deficient number, since it is larger than the sum of its proper divisors (1).

23737561 is an equidigital number, since it uses as much as digits as its factorization.

23737561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 34.

The square root of 23737561 is about 4872.1207907851. The cubic root of 23737561 is about 287.3946623550.

The spelling of 23737561 in words is "twenty-three million, seven hundred thirty-seven thousand, five hundred sixty-one".