172317953 has 2 divisors, whose sum is σ = 172317954. Its totient is φ = 172317952.

The previous prime is 172317941. The next prime is 172317961. The reversal of 172317953 is 359713271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119071744 + 53246209 = 10912^2 + 7297^2 .

It is a cyclic number.

It is not a de Polignac number, because 172317953 - 2⁶ = 172317889 is a prime.

It is a super-2 number, since 2×172317953² = 59386953852220418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172317653) 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 as a sum of consecutive naturals, namely, 86158976 + 86158977.

It is an arithmetic number, because the mean of its divisors is an integer number (86158977).

Almost surely, 2^172317953 is an apocalyptic number.

It is an amenable number.

172317953 is a deficient number, since it is larger than the sum of its proper divisors (1).

172317953 is an equidigital number, since it uses as much as digits as its factorization.

172317953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 38.

The square root of 172317953 is about 13126.9932962579. The cubic root of 172317953 is about 556.4722461993.

The spelling of 172317953 in words is "one hundred seventy-two million, three hundred seventeen thousand, nine hundred fifty-three".