57818981 has 4 divisors (see below), whose sum is σ = 63075264. Its totient is φ = 52562700.

The previous prime is 57818951. The next prime is 57818983. The reversal of 57818981 is 18981875.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57818981 is a prime.

It is a super-2 number, since 2×57818981² = 6686069127756722, 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 (57818983) 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, 2628125 + ... + 2628146.

It is an arithmetic number, because the mean of its divisors is an integer number (15768816).

Almost surely, 2^57818981 is an apocalyptic number.

It is an amenable number.

57818981 is a deficient number, since it is larger than the sum of its proper divisors (5256283).

57818981 is a wasteful number, since it uses less digits than its factorization.

57818981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5256282.

The product of its digits is 161280, while the sum is 47.

The square root of 57818981 is about 7603.8793388638. The cubic root of 57818981 is about 386.6845419633.

The spelling of 57818981 in words is "fifty-seven million, eight hundred eighteen thousand, nine hundred eighty-one".