55175391 has 16 divisors (see below), whose sum is σ = 82554720. Its totient is φ = 36417600.

The previous prime is 55175389. The next prime is 55175437. The reversal of 55175391 is 19357155.

55175391 is a `hidden beast` number, since 5 + 517 + 53 + 91 = 666.

It is not a de Polignac number, because 55175391 - 2¹ = 55175389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55175311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7390 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (5159670).

Almost surely, 2^55175391 is an apocalyptic number.

55175391 is a deficient number, since it is larger than the sum of its proper divisors (27379329).

55175391 is a wasteful number, since it uses less digits than its factorization.

55175391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20343 (or 20337 counting only the distinct ones).

The product of its digits is 23625, while the sum is 36.

The square root of 55175391 is about 7428.0139337511. The cubic root of 55175391 is about 380.6990617609.

The spelling of 55175391 in words is "fifty-five million, one hundred seventy-five thousand, three hundred ninety-one".