72172999 has 2 divisors, whose sum is σ = 72173000. Its totient is φ = 72172998.

The previous prime is 72172951. The next prime is 72173029. The reversal of 72172999 is 99927127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72172999 - 2⁹ = 72172487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72172099) 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, 36086499 + 36086500.

It is an arithmetic number, because the mean of its divisors is an integer number (36086500).

Almost surely, 2^72172999 is an apocalyptic number.

72172999 is a deficient number, since it is larger than the sum of its proper divisors (1).

72172999 is an equidigital number, since it uses as much as digits as its factorization.

72172999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 46.

The square root of 72172999 is about 8495.4693219386. The cubic root of 72172999 is about 416.3496947881.

The spelling of 72172999 in words is "seventy-two million, one hundred seventy-two thousand, nine hundred ninety-nine".