55351921 has 4 divisors (see below), whose sum is σ = 58265200. Its totient is φ = 52438644.

The previous prime is 55351909. The next prime is 55351931. The reversal of 55351921 is 12915355.

55351921 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 Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55351921 - 2²³ = 46963313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55351931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1456611 + ... + 1456648.

It is an arithmetic number, because the mean of its divisors is an integer number (14566300).

Almost surely, 2^55351921 is an apocalyptic number.

It is an amenable number.

55351921 is a deficient number, since it is larger than the sum of its proper divisors (2913279).

55351921 is a wasteful number, since it uses less digits than its factorization.

55351921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2913278.

The product of its digits is 6750, while the sum is 31.

The square root of 55351921 is about 7439.8871631228. The cubic root of 55351921 is about 381.1046366548.

The spelling of 55351921 in words is "fifty-five million, three hundred fifty-one thousand, nine hundred twenty-one".