172887557 has 2 divisors, whose sum is σ = 172887558. Its totient is φ = 172887556.

The previous prime is 172887551. The next prime is 172887571. The reversal of 172887557 is 755788271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86750596 + 86136961 = 9314^2 + 9281^2 .

It is a cyclic number.

It is not a de Polignac number, because 172887557 - 2¹⁶ = 172822021 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 (172887551) 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, 86443778 + 86443779.

It is an arithmetic number, because the mean of its divisors is an integer number (86443779).

Almost surely, 2^172887557 is an apocalyptic number.

It is an amenable number.

172887557 is a deficient number, since it is larger than the sum of its proper divisors (1).

172887557 is an equidigital number, since it uses as much as digits as its factorization.

172887557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1097600, while the sum is 50.

The square root of 172887557 is about 13148.6713016943. The cubic root of 172887557 is about 557.0847190548.

The spelling of 172887557 in words is "one hundred seventy-two million, eight hundred eighty-seven thousand, five hundred fifty-seven".