57181973 has 2 divisors, whose sum is σ = 57181974. Its totient is φ = 57181972.

The previous prime is 57181967. The next prime is 57181991. The reversal of 57181973 is 37918175.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32001649 + 25180324 = 5657^2 + 5018^2 .

It is a cyclic number.

It is not a de Polignac number, because 57181973 - 2¹² = 57177877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57181973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57181913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28590986 + 28590987.

It is an arithmetic number, because the mean of its divisors is an integer number (28590987).

Almost surely, 2^57181973 is an apocalyptic number.

It is an amenable number.

57181973 is a deficient number, since it is larger than the sum of its proper divisors (1).

57181973 is an equidigital number, since it uses as much as digits as its factorization.

57181973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 41.

The square root of 57181973 is about 7561.8762883295. The cubic root of 57181973 is about 385.2592238602.

The spelling of 57181973 in words is "fifty-seven million, one hundred eighty-one thousand, nine hundred seventy-three".