172151055 has 16 divisors (see below), whose sum is σ = 306046560. Its totient is φ = 91813824.

The previous prime is 172151053. The next prime is 172151071. The reversal of 172151055 is 550151271.

It is not a de Polignac number, because 172151055 - 2¹ = 172151053 is a prime.

It is a super-2 number, since 2×172151055² = 59271971475226050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172151051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 637462 + ... + 637731.

It is an arithmetic number, because the mean of its divisors is an integer number (19127910).

Almost surely, 2^172151055 is an apocalyptic number.

172151055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172151055 is a deficient number, since it is larger than the sum of its proper divisors (133895505).

172151055 is a wasteful number, since it uses less digits than its factorization.

172151055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275207 (or 1275201 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 27.

The square root of 172151055 is about 13120.6347026354. The cubic root of 172151055 is about 556.2925316972.

The spelling of 172151055 in words is "one hundred seventy-two million, one hundred fifty-one thousand, fifty-five".