57542809 has 2 divisors, whose sum is σ = 57542810. Its totient is φ = 57542808.

The previous prime is 57542767. The next prime is 57542813. The reversal of 57542809 is 90824575.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36336784 + 21206025 = 6028^2 + 4605^2 .

It is a cyclic number.

It is not a de Polignac number, because 57542809 - 2¹¹ = 57540761 is a prime.

It is a super-2 number, since 2×57542809² = 6622349735220962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (57542819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28771404 + 28771405.

It is an arithmetic number, because the mean of its divisors is an integer number (28771405).

Almost surely, 2^57542809 is an apocalyptic number.

It is an amenable number.

57542809 is a deficient number, since it is larger than the sum of its proper divisors (1).

57542809 is an equidigital number, since it uses as much as digits as its factorization.

57542809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 57542809 is about 7585.6976607297. The cubic root of 57542809 is about 386.0678936836.

The spelling of 57542809 in words is "fifty-seven million, five hundred forty-two thousand, eight hundred nine".