55451613 has 16 divisors (see below), whose sum is σ = 84613760. Its totient is φ = 31643136.

The previous prime is 55451609. The next prime is 55451647. The reversal of 55451613 is 31615455.

It is not a de Polignac number, because 55451613 - 2² = 55451609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55491613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19881 + ... + 22497.

It is an arithmetic number, because the mean of its divisors is an integer number (5288360).

Almost surely, 2^55451613 is an apocalyptic number.

It is an amenable number.

55451613 is a deficient number, since it is larger than the sum of its proper divisors (29162147).

55451613 is a wasteful number, since it uses less digits than its factorization.

55451613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636.

The product of its digits is 9000, while the sum is 30.

The square root of 55451613 is about 7446.5839819343. The cubic root of 55451613 is about 381.3332965718. Note that the first 3 decimals are identical.

The spelling of 55451613 in words is "fifty-five million, four hundred fifty-one thousand, six hundred thirteen".