23171913 has 10 divisors (see below), whose sum is σ = 34614954. Its totient is φ = 15447888.

The previous prime is 23171903. The next prime is 23171923. The reversal of 23171913 is 31917132.

It is an interprime number because it is at equal distance from previous prime (23171903) and next prime (23171923).

It can be written as a sum of positive squares in only one way, i.e., 22155849 + 1016064 = 4707^2 + 1008^2 .

It is not a de Polignac number, because 23171913 - 2¹² = 23167817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23171903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 142956 + ... + 143117.

Almost surely, 2^23171913 is an apocalyptic number.

It is an amenable number.

23171913 is a deficient number, since it is larger than the sum of its proper divisors (11443041).

23171913 is an equidigital number, since it uses as much as digits as its factorization.

23171913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286085 (or 286076 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 23171913 is about 4813.7213255443. The cubic root of 23171913 is about 285.0934873359.

The spelling of 23171913 in words is "twenty-three million, one hundred seventy-one thousand, nine hundred thirteen".