55913804521 has 3 divisors (see below), whose sum is σ = 55914040983. Its totient is φ = 55913568060.

The previous prime is 55913804501. The next prime is 55913804539. The reversal of 55913804521 is 12540831955.

The square root of 55913804521 is 236461.

It is a perfect power (a square), and thus also a powerful number.

55913804521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 only one way, i.e., 5477628121 + 50436176400 = 74011^2 + 224580^2 .

It is not a de Polignac number, because 55913804521 - 2¹⁷ = 55913673449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55913804501) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 118231 + ... + 354691.

It is an arithmetic number, because the mean of its divisors is an integer number (18638013661).

Almost surely, 2^55913804521 is an apocalyptic number.

55913804521 is the 236461-st square number.

55913804521 is the 118231-st centered octagonal number.

It is an amenable number.

55913804521 is a deficient number, since it is larger than the sum of its proper divisors (236462).

55913804521 is an frugal number, since it uses more digits than its factorization.

55913804521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472922 (or 236461 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 55913804521 in words is "fifty-five billion, nine hundred thirteen million, eight hundred four thousand, five hundred twenty-one".