172245915 has 24 divisors (see below), whose sum is σ = 306631728. Its totient is φ = 89380800.

The previous prime is 172245911. The next prime is 172245943. The reversal of 172245915 is 519542271.

It is not a de Polignac number, because 172245915 - 2² = 172245911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172245915.

It is not an unprimeable number, because it can be changed into a prime (172245911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50061 + ... + 53390.

It is an arithmetic number, because the mean of its divisors is an integer number (12776322).

Almost surely, 2^172245915 is an apocalyptic number.

172245915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172245915 is a deficient number, since it is larger than the sum of its proper divisors (134385813).

172245915 is a wasteful number, since it uses less digits than its factorization.

172245915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103499 (or 103496 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 172245915 is about 13124.2491213783. The cubic root of 172245915 is about 556.3946904669.

The spelling of 172245915 in words is "one hundred seventy-two million, two hundred forty-five thousand, nine hundred fifteen".