55079921 has 4 divisors (see below), whose sum is σ = 59316852. Its totient is φ = 50842992.

The previous prime is 55079837. The next prime is 55079923. The reversal of 55079921 is 12997055.

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 4669921 + 50410000 = 2161^2 + 7100^2 .

It is a cyclic number.

It is not a de Polignac number, because 55079921 - 2¹⁴ = 55063537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55079923) 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, 2118446 + ... + 2118471.

It is an arithmetic number, because the mean of its divisors is an integer number (14829213).

Almost surely, 2^55079921 is an apocalyptic number.

It is an amenable number.

55079921 is a deficient number, since it is larger than the sum of its proper divisors (4236931).

55079921 is a wasteful number, since it uses less digits than its factorization.

55079921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4236930.

The product of its (nonzero) digits is 28350, while the sum is 38.

The square root of 55079921 is about 7421.5848038003. The cubic root of 55079921 is about 380.4793604186.

The spelling of 55079921 in words is "fifty-five million, seventy-nine thousand, nine hundred twenty-one".