172157115 has 64 divisors (see below), whose sum is σ = 308883456. Its totient is φ = 81326592.

The previous prime is 172157101. The next prime is 172157123. The reversal of 172157115 is 511751271.

172157115 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172157115 - 2¹⁸ = 171894971 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 771894 + ... + 772116.

It is an arithmetic number, because the mean of its divisors is an integer number (4826304).

Almost surely, 2^172157115 is an apocalyptic number.

172157115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

172157115 is a deficient number, since it is larger than the sum of its proper divisors (136726341).

172157115 is a wasteful number, since it uses less digits than its factorization.

172157115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388.

The product of its digits is 2450, while the sum is 30.

The square root of 172157115 is about 13120.8656345532. The cubic root of 172157115 is about 556.2990590910.

The spelling of 172157115 in words is "one hundred seventy-two million, one hundred fifty-seven thousand, one hundred fifteen".