57175721 has 2 divisors, whose sum is σ = 57175722. Its totient is φ = 57175720.

The previous prime is 57175669. The next prime is 57175739. The reversal of 57175721 is 12757175.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30250000 + 26925721 = 5500^2 + 5189^2 .

It is a cyclic number.

It is not a de Polignac number, because 57175721 - 2¹⁰ = 57174697 is a prime.

It is not a weakly prime, because it can be changed into another prime (57175751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28587860 + 28587861.

It is an arithmetic number, because the mean of its divisors is an integer number (28587861).

Almost surely, 2^57175721 is an apocalyptic number.

It is an amenable number.

57175721 is a deficient number, since it is larger than the sum of its proper divisors (1).

57175721 is an equidigital number, since it uses as much as digits as its factorization.

57175721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17150, while the sum is 35.

The square root of 57175721 is about 7561.4628875635. The cubic root of 57175721 is about 385.2451825559.

The spelling of 57175721 in words is "fifty-seven million, one hundred seventy-five thousand, seven hundred twenty-one".