55172975 has 72 divisors (see below), whose sum is σ = 85890336. Its totient is φ = 34848000.

The previous prime is 55172917. The next prime is 55172977. The reversal of 55172975 is 57927155.

It is not a de Polignac number, because 55172975 - 2¹⁸ = 54910831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55172977) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 904445 + ... + 904505.

Almost surely, 2^55172975 is an apocalyptic number.

55172975 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55172975 is a deficient number, since it is larger than the sum of its proper divisors (30717361).

55172975 is a wasteful number, since it uses less digits than its factorization.

55172975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 113 counting only the distinct ones).

The product of its digits is 110250, while the sum is 41.

The square root of 55172975 is about 7427.8513043814. The cubic root of 55172975 is about 380.6935050423.

The spelling of 55172975 in words is "fifty-five million, one hundred seventy-two thousand, nine hundred seventy-five".