155505172 has 12 divisors (see below), whose sum is σ = 272222496. Its totient is φ = 77727320.

The previous prime is 155505151. The next prime is 155505173. The reversal of 155505172 is 271505551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155505173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17547 + ... + 24877.

It is an arithmetic number, because the mean of its divisors is an integer number (22685208).

Almost surely, 2^155505172 is an apocalyptic number.

It is an amenable number.

155505172 is a deficient number, since it is larger than the sum of its proper divisors (116717324).

155505172 is a wasteful number, since it uses less digits than its factorization.

155505172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12638 (or 12636 counting only the distinct ones).

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 155505172 is about 12470.1712899222. The cubic root of 155505172 is about 537.7514779249.

The spelling of 155505172 in words is "one hundred fifty-five million, five hundred five thousand, one hundred seventy-two".