57322921 has 2 divisors, whose sum is σ = 57322922. Its totient is φ = 57322920.

The previous prime is 57322919. The next prime is 57322927. The reversal of 57322921 is 12922375.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30913600 + 26409321 = 5560^2 + 5139^2 .

It is a cyclic number.

It is not a de Polignac number, because 57322921 - 2¹ = 57322919 is a prime.

Together with 57322919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (57322927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28661460 + 28661461.

It is an arithmetic number, because the mean of its divisors is an integer number (28661461).

Almost surely, 2^57322921 is an apocalyptic number.

It is an amenable number.

57322921 is a deficient number, since it is larger than the sum of its proper divisors (1).

57322921 is an equidigital number, since it uses as much as digits as its factorization.

57322921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 57322921 is about 7571.1901970562. The cubic root of 57322921 is about 385.5755063017.

The spelling of 57322921 in words is "fifty-seven million, three hundred twenty-two thousand, nine hundred twenty-one".