172155613 has 8 divisors (see below), whose sum is σ = 198491328. Its totient is φ = 146255424.

The previous prime is 172155601. The next prime is 172155619. The reversal of 172155613 is 316551271.

172155613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-172155613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172155619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108031 + ... + 109612.

It is an arithmetic number, because the mean of its divisors is an integer number (24811416).

Almost surely, 2^172155613 is an apocalyptic number.

It is an amenable number.

172155613 is a deficient number, since it is larger than the sum of its proper divisors (26335715).

172155613 is a wasteful number, since it uses less digits than its factorization.

172155613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217763.

The product of its digits is 6300, while the sum is 31.

The square root of 172155613 is about 13120.8083973511. The cubic root of 172155613 is about 556.2974412595.

The spelling of 172155613 in words is "one hundred seventy-two million, one hundred fifty-five thousand, six hundred thirteen".