57299981 has 2 divisors, whose sum is σ = 57299982. Its totient is φ = 57299980.

The previous prime is 57299947. The next prime is 57299989. The reversal of 57299981 is 18999275.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 70756 = 7565^2 + 266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57299981 is a prime.

It is a super-2 number, since 2×57299981² = 6566575645200722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57299989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28649990 + 28649991.

It is an arithmetic number, because the mean of its divisors is an integer number (28649991).

Almost surely, 2^57299981 is an apocalyptic number.

It is an amenable number.

57299981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57299981 is an equidigital number, since it uses as much as digits as its factorization.

57299981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 57299981 is about 7569.6750921027. The cubic root of 57299981 is about 385.5240650857.

The spelling of 57299981 in words is "fifty-seven million, two hundred ninety-nine thousand, nine hundred eighty-one".