55583321 has 2 divisors, whose sum is σ = 55583322. Its totient is φ = 55583320.

The previous prime is 55583317. The next prime is 55583323. The reversal of 55583321 is 12338555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 1413721 = 7360^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 55583321 - 2² = 55583317 is a prime.

Together with 55583323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55583323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27791660 + 27791661.

It is an arithmetic number, because the mean of its divisors is an integer number (27791661).

Almost surely, 2^55583321 is an apocalyptic number.

It is an amenable number.

55583321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55583321 is an equidigital number, since it uses as much as digits as its factorization.

55583321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18000, while the sum is 32.

The square root of 55583321 is about 7455.4222549766. The cubic root of 55583321 is about 381.6349705970.

The spelling of 55583321 in words is "fifty-five million, five hundred eighty-three thousand, three hundred twenty-one".