55321919 has 8 divisors (see below), whose sum is σ = 57141360. Its totient is φ = 53519616.

The previous prime is 55321909. The next prime is 55321991. The reversal of 55321919 is 91912355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55321919 - 2²⁴ = 38544703 is a prime.

It is a super-2 number, since 2×55321919² = 6121029443685122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55321909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2447 + ... + 10799.

It is an arithmetic number, because the mean of its divisors is an integer number (7142670).

Almost surely, 2^55321919 is an apocalyptic number.

55321919 is a deficient number, since it is larger than the sum of its proper divisors (1819441).

55321919 is a wasteful number, since it uses less digits than its factorization.

55321919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8569.

The product of its digits is 12150, while the sum is 35.

The square root of 55321919 is about 7437.8705958090. The cubic root of 55321919 is about 381.0357684172.

The spelling of 55321919 in words is "fifty-five million, three hundred twenty-one thousand, nine hundred nineteen".