23553581 has 2 divisors, whose sum is σ = 23553582. Its totient is φ = 23553580.

The previous prime is 23553553. The next prime is 23553617. The reversal of 23553581 is 18535532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13756681 + 9796900 = 3709^2 + 3130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23553581 is a prime.

It is a super-2 number, since 2×23553581² = 1109542355847122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23553181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11776790 + 11776791.

It is an arithmetic number, because the mean of its divisors is an integer number (11776791).

Almost surely, 2^23553581 is an apocalyptic number.

It is an amenable number.

23553581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23553581 is an equidigital number, since it uses as much as digits as its factorization.

23553581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 32.

The square root of 23553581 is about 4853.2031690421. The cubic root of 23553581 is about 286.6502434855.

The spelling of 23553581 in words is "twenty-three million, five hundred fifty-three thousand, five hundred eighty-one".