172289939 has 2 divisors, whose sum is σ = 172289940. Its totient is φ = 172289938.

The previous prime is 172289893. The next prime is 172289947. The reversal of 172289939 is 939982271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172289939 is a prime.

It is not a weakly prime, because it can be changed into another prime (172289959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86144969 + 86144970.

It is an arithmetic number, because the mean of its divisors is an integer number (86144970).

Almost surely, 2^172289939 is an apocalyptic number.

172289939 is a deficient number, since it is larger than the sum of its proper divisors (1).

172289939 is an equidigital number, since it uses as much as digits as its factorization.

172289939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 172289939 is about 13125.9262149381. The cubic root of 172289939 is about 556.4420890429.

The spelling of 172289939 in words is "one hundred seventy-two million, two hundred eighty-nine thousand, nine hundred thirty-nine".