55180513 has 4 divisors (see below), whose sum is σ = 55231380. Its totient is φ = 55129648.

The previous prime is 55180493. The next prime is 55180529. The reversal of 55180513 is 31508155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 760384 + 54420129 = 872^2 + 7377^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55180513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55180613) 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, 23770 + ... + 25987.

It is an arithmetic number, because the mean of its divisors is an integer number (13807845).

Almost surely, 2^55180513 is an apocalyptic number.

It is an amenable number.

55180513 is a deficient number, since it is larger than the sum of its proper divisors (50867).

55180513 is a wasteful number, since it uses less digits than its factorization.

55180513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50866.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 55180513 is about 7428.3587016245. The cubic root of 55180513 is about 380.7108416518.

Adding to 55180513 its reverse (31508155), we get a palindrome (86688668).

The spelling of 55180513 in words is "fifty-five million, one hundred eighty thousand, five hundred thirteen".