172163917 has 2 divisors, whose sum is σ = 172163918. Its totient is φ = 172163916.

The previous prime is 172163909. The next prime is 172163939. The reversal of 172163917 is 719361271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168454441 + 3709476 = 12979^2 + 1926^2 .

It is a cyclic number.

It is not a de Polignac number, because 172163917 - 2³ = 172163909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172163977) 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, 86081958 + 86081959.

It is an arithmetic number, because the mean of its divisors is an integer number (86081959).

Almost surely, 2^172163917 is an apocalyptic number.

It is an amenable number.

172163917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172163917 is an equidigital number, since it uses as much as digits as its factorization.

172163917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 37.

The square root of 172163917 is about 13121.1248374520. The cubic root of 172163917 is about 556.3063855311.

The spelling of 172163917 in words is "one hundred seventy-two million, one hundred sixty-three thousand, nine hundred seventeen".