172155542 has 64 divisors (see below), whose sum is σ = 309355200. Its totient is φ = 71124480.

The previous prime is 172155541. The next prime is 172155589. The reversal of 172155542 is 245551271.

It is a junction number, because it is equal to n+sod(n) for n = 172155499 and 172155508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172155541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 873788 + ... + 873984.

It is an arithmetic number, because the mean of its divisors is an integer number (4833675).

Almost surely, 2^172155542 is an apocalyptic number.

172155542 is a deficient number, since it is larger than the sum of its proper divisors (137199658).

172155542 is a wasteful number, since it uses less digits than its factorization.

172155542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321.

The product of its digits is 14000, while the sum is 32.

The square root of 172155542 is about 13120.8056917249. The cubic root of 172155542 is about 556.2973647838.

The spelling of 172155542 in words is "one hundred seventy-two million, one hundred fifty-five thousand, five hundred forty-two".