54165591 has 20 divisors (see below), whose sum is σ = 83707800. Its totient is φ = 34863696.

The previous prime is 54165563. The next prime is 54165607. The reversal of 54165591 is 19556145.

54165591 is a `hidden beast` number, since 5 + 4 + 1 + 65 + 591 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-54165591 is a prime.

It is a super-2 number, since 2×54165591² = 5867822496758562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54165491) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9181 + ... + 13878.

It is an arithmetic number, because the mean of its divisors is an integer number (4185390).

Almost surely, 2^54165591 is an apocalyptic number.

54165591 is a deficient number, since it is larger than the sum of its proper divisors (29542209).

54165591 is a wasteful number, since it uses less digits than its factorization.

54165591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23100 (or 23091 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 54165591 is about 7359.7276444173. The cubic root of 54165591 is about 378.3622755108.

It can be divided in two parts, 54165 and 591, that added together give a square (54756 = 234²).

The spelling of 54165591 in words is "fifty-four million, one hundred sixty-five thousand, five hundred ninety-one".