57089491 has 2 divisors, whose sum is σ = 57089492. Its totient is φ = 57089490.

The previous prime is 57089489. The next prime is 57089497. The reversal of 57089491 is 19498075.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57089491 - 2¹ = 57089489 is a prime.

Together with 57089489, it forms a pair of twin primes.

It is equal to p_3399469 and since 57089491 and 3399469 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (57089497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28544745 + 28544746.

It is an arithmetic number, because the mean of its divisors is an integer number (28544746).

Almost surely, 2^57089491 is an apocalyptic number.

57089491 is a deficient number, since it is larger than the sum of its proper divisors (1).

57089491 is an equidigital number, since it uses as much as digits as its factorization.

57089491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 57089491 is about 7555.7587971030. The cubic root of 57089491 is about 385.0514149584.

The spelling of 57089491 in words is "fifty-seven million, eighty-nine thousand, four hundred ninety-one".