55391613 has 8 divisors (see below), whose sum is σ = 77066688. Its totient is φ = 35322144.

The previous prime is 55391603. The next prime is 55391617. The reversal of 55391613 is 31619355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55391613 - 2⁶ = 55391549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55391617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401320 + ... + 401457.

It is an arithmetic number, because the mean of its divisors is an integer number (9633336).

Almost surely, 2^55391613 is an apocalyptic number.

It is an amenable number.

55391613 is a deficient number, since it is larger than the sum of its proper divisors (21675075).

55391613 is a wasteful number, since it uses less digits than its factorization.

55391613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802803.

The product of its digits is 12150, while the sum is 33.

The square root of 55391613 is about 7442.5541986606. The cubic root of 55391613 is about 381.1957096213.

The spelling of 55391613 in words is "fifty-five million, three hundred ninety-one thousand, six hundred thirteen".