172089155 has 32 divisors (see below), whose sum is σ = 240637824. Its totient is φ = 115716096.

The previous prime is 172089143. The next prime is 172089167. The reversal of 172089155 is 551980271.

172089155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172089143) and next prime (172089167).

It is a cyclic number.

It is not a de Polignac number, because 172089155 - 2¹⁰ = 172088131 is a prime.

It is a super-2 number, since 2×172089155² = 59229354537228050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 587189 + ... + 587481.

It is an arithmetic number, because the mean of its divisors is an integer number (7519932).

Almost surely, 2^172089155 is an apocalyptic number.

172089155 is a deficient number, since it is larger than the sum of its proper divisors (68548669).

172089155 is a wasteful number, since it uses less digits than its factorization.

172089155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 172089155 is about 13118.2756107653. The cubic root of 172089155 is about 556.2258487179.

The spelling of 172089155 in words is "one hundred seventy-two million, eighty-nine thousand, one hundred fifty-five".