55513591 has 16 divisors (see below), whose sum is σ = 66119680. Its totient is φ = 45606240.

The previous prime is 55513589. The next prime is 55513603. The reversal of 55513591 is 19531555.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55513591 - 2¹ = 55513589 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 (55513541) 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, 22480 + ... + 24826.

It is an arithmetic number, because the mean of its divisors is an integer number (4132480).

Almost surely, 2^55513591 is an apocalyptic number.

55513591 is a deficient number, since it is larger than the sum of its proper divisors (10606089).

55513591 is a wasteful number, since it uses less digits than its factorization.

55513591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494.

The product of its digits is 16875, while the sum is 34.

The square root of 55513591 is about 7450.7443252336. The cubic root of 55513591 is about 381.4753151350.

The spelling of 55513591 in words is "fifty-five million, five hundred thirteen thousand, five hundred ninety-one".