55576321 has 2 divisors, whose sum is σ = 55576322. Its totient is φ = 55576320.

The previous prime is 55576319. The next prime is 55576327. The reversal of 55576321 is 12367555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53217025 + 2359296 = 7295^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 55576321 - 2¹ = 55576319 is a prime.

Together with 55576319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55576327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27788160 + 27788161.

It is an arithmetic number, because the mean of its divisors is an integer number (27788161).

Almost surely, 2^55576321 is an apocalyptic number.

It is an amenable number.

55576321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55576321 is an equidigital number, since it uses as much as digits as its factorization.

55576321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31500, while the sum is 34.

The square root of 55576321 is about 7454.9527832173. The cubic root of 55576321 is about 381.6189492624.

The spelling of 55576321 in words is "fifty-five million, five hundred seventy-six thousand, three hundred twenty-one".