55321973 has 4 divisors (see below), whose sum is σ = 63225120. Its totient is φ = 47418828.

The previous prime is 55321909. The next prime is 55321991. The reversal of 55321973 is 37912355.

It is a happy number.

55321973 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 55321973 - 2⁶ = 55321909 is a prime.

It is a super-2 number, since 2×55321973² = 6121041393225458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55321573) 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, 3951563 + ... + 3951576.

It is an arithmetic number, because the mean of its divisors is an integer number (15806280).

Almost surely, 2^55321973 is an apocalyptic number.

It is an amenable number.

55321973 is a deficient number, since it is larger than the sum of its proper divisors (7903147).

55321973 is an equidigital number, since it uses as much as digits as its factorization.

55321973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903146.

The product of its digits is 28350, while the sum is 35.

The square root of 55321973 is about 7437.8742258793. The cubic root of 55321973 is about 381.0358923941.

The spelling of 55321973 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred seventy-three".