55085791 has 4 divisors (see below), whose sum is σ = 56862784. Its totient is φ = 53308800.

The previous prime is 55085773. The next prime is 55085861. The reversal of 55085791 is 19758055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19758055 = 5 ⋅3951611.

It is a cyclic number.

It is not a de Polignac number, because 55085791 - 2⁷ = 55085663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55082791) 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, 888450 + ... + 888511.

It is an arithmetic number, because the mean of its divisors is an integer number (14215696).

Almost surely, 2^55085791 is an apocalyptic number.

55085791 is a deficient number, since it is larger than the sum of its proper divisors (1776993).

55085791 is a wasteful number, since it uses less digits than its factorization.

55085791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776992.

The product of its (nonzero) digits is 63000, while the sum is 40.

The square root of 55085791 is about 7421.9802613588. The cubic root of 55085791 is about 380.4928761395.

The spelling of 55085791 in words is "fifty-five million, eighty-five thousand, seven hundred ninety-one".