57991537 has 2 divisors, whose sum is σ = 57991538. Its totient is φ = 57991536.

The previous prime is 57991523. The next prime is 57991613. The reversal of 57991537 is 73519975.

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., 42302016 + 15689521 = 6504^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 57991537 - 2¹¹ = 57989489 is a prime.

It is not a weakly prime, because it can be changed into another prime (57994537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28995768 + 28995769.

It is an arithmetic number, because the mean of its divisors is an integer number (28995769).

Almost surely, 2^57991537 is an apocalyptic number.

It is an amenable number.

57991537 is a deficient number, since it is larger than the sum of its proper divisors (1).

57991537 is an equidigital number, since it uses as much as digits as its factorization.

57991537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 297675, while the sum is 46.

The square root of 57991537 is about 7615.2174624235. The cubic root of 57991537 is about 387.0688360039.

The spelling of 57991537 in words is "fifty-seven million, nine hundred ninety-one thousand, five hundred thirty-seven".