57998981 has 2 divisors, whose sum is σ = 57998982. Its totient is φ = 57998980.

The previous prime is 57998971. The next prime is 57998999. The reversal of 57998981 is 18989975.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47141956 + 10857025 = 6866^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 57998981 - 2¹⁸ = 57736837 is a prime.

It is a super-2 number, since 2×57998981² = 6727763594076722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57998971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28999490 + 28999491.

It is an arithmetic number, because the mean of its divisors is an integer number (28999491).

Almost surely, 2^57998981 is an apocalyptic number.

It is an amenable number.

57998981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57998981 is an equidigital number, since it uses as much as digits as its factorization.

57998981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 56.

The square root of 57998981 is about 7615.7062049425. The cubic root of 57998981 is about 387.0853971396.

The spelling of 57998981 in words is "fifty-seven million, nine hundred ninety-eight thousand, nine hundred eighty-one".