23172949 has 2 divisors, whose sum is σ = 23172950. Its totient is φ = 23172948.

The previous prime is 23172923. The next prime is 23172973. The reversal of 23172949 is 94927132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12888100 + 10284849 = 3590^2 + 3207^2 .

It is a cyclic number.

It is not a de Polignac number, because 23172949 - 2⁹ = 23172437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23172049) 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, 11586474 + 11586475.

It is an arithmetic number, because the mean of its divisors is an integer number (11586475).

Almost surely, 2^23172949 is an apocalyptic number.

It is an amenable number.

23172949 is a deficient number, since it is larger than the sum of its proper divisors (1).

23172949 is an equidigital number, since it uses as much as digits as its factorization.

23172949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 37.

The square root of 23172949 is about 4813.8289333960. The cubic root of 23172949 is about 285.0977360493.

The spelling of 23172949 in words is "twenty-three million, one hundred seventy-two thousand, nine hundred forty-nine".