172872989 has 2 divisors, whose sum is σ = 172872990. Its totient is φ = 172872988.

The previous prime is 172872941. The next prime is 172873027. The reversal of 172872989 is 989278271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124500964 + 48372025 = 11158^2 + 6955^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172872989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172872989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172802989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86436494 + 86436495.

It is an arithmetic number, because the mean of its divisors is an integer number (86436495).

Almost surely, 2^172872989 is an apocalyptic number.

It is an amenable number.

172872989 is a deficient number, since it is larger than the sum of its proper divisors (1).

172872989 is an equidigital number, since it uses as much as digits as its factorization.

172872989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 172872989 is about 13148.1173176999. The cubic root of 172872989 is about 557.0690714314.

The spelling of 172872989 in words is "one hundred seventy-two million, eight hundred seventy-two thousand, nine hundred eighty-nine".