57000081 has 4 divisors (see below), whose sum is σ = 76000112. Its totient is φ = 38000052.

The previous prime is 57000071. The next prime is 57000089. The reversal of 57000081 is 18000075.

It is a happy number.

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 not a de Polignac number, because 57000081 - 2¹¹ = 56998033 is a prime.

It is a super-2 number, since 2×57000081² = 6498018468013122, which contains 22 as substring.

It is a Duffinian number.

57000081 is a modest number, since divided by 81 gives 57 as remainder.

It is not an unprimeable number, because it can be changed into a prime (57000089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9500011 + ... + 9500016.

It is an arithmetic number, because the mean of its divisors is an integer number (19000028).

Almost surely, 2^57000081 is an apocalyptic number.

It is an amenable number.

57000081 is a deficient number, since it is larger than the sum of its proper divisors (19000031).

57000081 is a wasteful number, since it uses less digits than its factorization.

57000081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19000030.

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 57000081 is about 7549.8397996249. The cubic root of 57000081 is about 384.8502954250.

The spelling of 57000081 in words is "fifty-seven million, eighty-one", and thus it is an aban number and an uban number.