23505661 has 2 divisors, whose sum is σ = 23505662. Its totient is φ = 23505660.

The previous prime is 23505637. The next prime is 23505667. The reversal of 23505661 is 16650532.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 4756761 = 4330^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 23505661 - 2¹⁵ = 23472893 is a prime.

It is equal to p_1478044 and since 23505661 and 1478044 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23505667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11752830 + 11752831.

It is an arithmetic number, because the mean of its divisors is an integer number (11752831).

Almost surely, 2^23505661 is an apocalyptic number.

It is an amenable number.

23505661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23505661 is an equidigital number, since it uses as much as digits as its factorization.

23505661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 23505661 is about 4848.2637098244. The cubic root of 23505661 is about 286.4557138902.

The spelling of 23505661 in words is "twenty-three million, five hundred five thousand, six hundred sixty-one".