57180981 has 24 divisors (see below), whose sum is σ = 90071136. Its totient is φ = 31986240.

The previous prime is 57180961. The next prime is 57180983. The reversal of 57180981 is 18908175.

It is not a de Polignac number, because 57180981 - 2⁶ = 57180917 is a prime.

It is a super-2 number, since 2×57180981² = 6539329176244722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57180983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 451 + ... + 10703.

It is an arithmetic number, because the mean of its divisors is an integer number (3752964).

Almost surely, 2^57180981 is an apocalyptic number.

It is an amenable number.

57180981 is a deficient number, since it is larger than the sum of its proper divisors (32890155).

57180981 is a wasteful number, since it uses less digits than its factorization.

57180981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10293 (or 10280 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 57180981 is about 7561.8106958585. The cubic root of 57180981 is about 385.2569960056.

The spelling of 57180981 in words is "fifty-seven million, one hundred eighty thousand, nine hundred eighty-one".