172071855 has 72 divisors (see below), whose sum is σ = 323447904. Its totient is φ = 84458880.

The previous prime is 172071839. The next prime is 172071871. The reversal of 172071855 is 558170271.

It is an interprime number because it is at equal distance from previous prime (172071839) and next prime (172071871).

It is not a de Polignac number, because 172071855 - 2⁴ = 172071839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 994549 + ... + 994721.

It is an arithmetic number, because the mean of its divisors is an integer number (4492332).

Almost surely, 2^172071855 is an apocalyptic number.

172071855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172071855 is a deficient number, since it is larger than the sum of its proper divisors (151376049).

172071855 is a wasteful number, since it uses less digits than its factorization.

172071855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 36.

The square root of 172071855 is about 13117.6162087477. The cubic root of 172071855 is about 556.2072090973.

The spelling of 172071855 in words is "one hundred seventy-two million, seventy-one thousand, eight hundred fifty-five".