57991491 has 16 divisors (see below), whose sum is σ = 86083200. Its totient is φ = 38584584.

The previous prime is 57991457. The next prime is 57991501. The reversal of 57991491 is 19419975.

57991491 is a `hidden beast` number, since 5 + 79 + 91 + 491 = 666.

57991491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57991491 - 2¹⁰ = 57990467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57991411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14020 + ... + 17678.

It is an arithmetic number, because the mean of its divisors is an integer number (5380200).

Almost surely, 2^57991491 is an apocalyptic number.

57991491 is a deficient number, since it is larger than the sum of its proper divisors (28091709).

57991491 is a wasteful number, since it uses less digits than its factorization.

57991491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4255 (or 4249 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 57991491 is about 7615.2144421546. The cubic root of 57991491 is about 387.0687336604.

The spelling of 57991491 in words is "fifty-seven million, nine hundred ninety-one thousand, four hundred ninety-one".