57907981 has 2 divisors, whose sum is σ = 57907982. Its totient is φ = 57907980.

The previous prime is 57907957. The next prime is 57907999. The reversal of 57907981 is 18970975.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 20331081 = 6130^2 + 4509^2 .

It is a cyclic number.

It is not a de Polignac number, because 57907981 - 2¹³ = 57899789 is a prime.

It is a super-2 number, since 2×57907981² = 6706668526992722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57907921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28953990 + 28953991.

It is an arithmetic number, because the mean of its divisors is an integer number (28953991).

Almost surely, 2^57907981 is an apocalyptic number.

It is an amenable number.

57907981 is a deficient number, since it is larger than the sum of its proper divisors (1).

57907981 is an equidigital number, since it uses as much as digits as its factorization.

57907981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 158760, while the sum is 46.

The square root of 57907981 is about 7609.7293644387. The cubic root of 57907981 is about 386.8828463988.

The spelling of 57907981 in words is "fifty-seven million, nine hundred seven thousand, nine hundred eighty-one".