57611821 has 2 divisors, whose sum is σ = 57611822. Its totient is φ = 57611820.

The previous prime is 57611797. The next prime is 57611831. The reversal of 57611821 is 12811675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57608100 + 3721 = 7590^2 + 61^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57611821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57611831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28805910 + 28805911.

It is an arithmetic number, because the mean of its divisors is an integer number (28805911).

Almost surely, 2^57611821 is an apocalyptic number.

It is an amenable number.

57611821 is a deficient number, since it is larger than the sum of its proper divisors (1).

57611821 is an equidigital number, since it uses as much as digits as its factorization.

57611821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 31.

The square root of 57611821 is about 7590.2451212066. The cubic root of 57611821 is about 386.2221711324. Note that the first 3 decimals are identical.

The spelling of 57611821 in words is "fifty-seven million, six hundred eleven thousand, eight hundred twenty-one".