55951613 has 4 divisors (see below), whose sum is σ = 55966620. Its totient is φ = 55936608.

The previous prime is 55951589. The next prime is 55951627. The reversal of 55951613 is 31615955.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13935289 + 42016324 = 3733^2 + 6482^2 .

It is a cyclic number.

It is not a de Polignac number, because 55951613 - 2⁶ = 55951549 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 (55951673) 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, 2873 + ... + 10961.

It is an arithmetic number, because the mean of its divisors is an integer number (13991655).

Almost surely, 2^55951613 is an apocalyptic number.

It is an amenable number.

55951613 is a deficient number, since it is larger than the sum of its proper divisors (15007).

55951613 is an equidigital number, since it uses as much as digits as its factorization.

55951613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15006.

The product of its digits is 20250, while the sum is 35.

The square root of 55951613 is about 7480.0810824482. The cubic root of 55951613 is about 382.4760131340.

The spelling of 55951613 in words is "fifty-five million, nine hundred fifty-one thousand, six hundred thirteen".