172667617 has 2 divisors, whose sum is σ = 172667618. Its totient is φ = 172667616.

The previous prime is 172667597. The next prime is 172667633. The reversal of 172667617 is 716766271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102090816 + 70576801 = 10104^2 + 8401^2 .

It is a cyclic number.

It is not a de Polignac number, because 172667617 - 2¹⁹ = 172143329 is a prime.

It is not a weakly prime, because it can be changed into another prime (172667017) 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, 86333808 + 86333809.

It is an arithmetic number, because the mean of its divisors is an integer number (86333809).

Almost surely, 2^172667617 is an apocalyptic number.

It is an amenable number.

172667617 is a deficient number, since it is larger than the sum of its proper divisors (1).

172667617 is an equidigital number, since it uses as much as digits as its factorization.

172667617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 43.

The square root of 172667617 is about 13140.3050573417. The cubic root of 172667617 is about 556.8483858583.

The spelling of 172667617 in words is "one hundred seventy-two million, six hundred sixty-seven thousand, six hundred seventeen".