57156989 has 4 divisors (see below), whose sum is σ = 57447324. Its totient is φ = 56866656.

The previous prime is 57156977. The next prime is 57157007. The reversal of 57156989 is 98965175.

57156989 = 167² + 168² + ... + 560².

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30891364 + 26265625 = 5558^2 + 5125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57156989 is a prime.

It is a super-2 number, since 2×57156989² = 6533842783092242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57156929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144872 + ... + 145265.

It is an arithmetic number, because the mean of its divisors is an integer number (14361831).

Almost surely, 2^57156989 is an apocalyptic number.

It is an amenable number.

57156989 is a deficient number, since it is larger than the sum of its proper divisors (290335).

57156989 is a wasteful number, since it uses less digits than its factorization.

57156989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290334.

The product of its digits is 680400, while the sum is 50.

The square root of 57156989 is about 7560.2241368891. The cubic root of 57156989 is about 385.2031064155.

The spelling of 57156989 in words is "fifty-seven million, one hundred fifty-six thousand, nine hundred eighty-nine".