55790591 has 4 divisors (see below), whose sum is σ = 55948992. Its totient is φ = 55632192.

The previous prime is 55790587. The next prime is 55790599. The reversal of 55790591 is 19509755.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19509755 = 5 ⋅3901951.

It is a cyclic number.

It is not a de Polignac number, because 55790591 - 2² = 55790587 is a prime.

It is a super-2 number, since 2×55790591² = 6225180088258562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55790599) 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, 78671 + ... + 79376.

It is an arithmetic number, because the mean of its divisors is an integer number (13987248).

Almost surely, 2^55790591 is an apocalyptic number.

55790591 is a deficient number, since it is larger than the sum of its proper divisors (158401).

55790591 is a wasteful number, since it uses less digits than its factorization.

55790591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158400.

The product of its (nonzero) digits is 70875, while the sum is 41.

The square root of 55790591 is about 7469.3099413534. The cubic root of 55790591 is about 382.1087539735.

The spelling of 55790591 in words is "fifty-five million, seven hundred ninety thousand, five hundred ninety-one".