172887917 has 2 divisors, whose sum is σ = 172887918. Its totient is φ = 172887916.

The previous prime is 172887893. The next prime is 172887947. The reversal of 172887917 is 719788271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140043556 + 32844361 = 11834^2 + 5731^2 .

It is a cyclic number.

It is not a de Polignac number, because 172887917 - 2¹⁴ = 172871533 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 (172887947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86443958 + 86443959.

It is an arithmetic number, because the mean of its divisors is an integer number (86443959).

Almost surely, 2^172887917 is an apocalyptic number.

It is an amenable number.

172887917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172887917 is an equidigital number, since it uses as much as digits as its factorization.

172887917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 50.

The square root of 172887917 is about 13148.6849912833. The cubic root of 172887917 is about 557.0851057230.

The spelling of 172887917 in words is "one hundred seventy-two million, eight hundred eighty-seven thousand, nine hundred seventeen".