57216081 has 16 divisors (see below), whose sum is σ = 82889856. Its totient is φ = 34895616.

The previous prime is 57216073. The next prime is 57216083. The reversal of 57216081 is 18061275.

It is not a de Polignac number, because 57216081 - 2³ = 57216073 is a prime.

It is a super-2 number, since 2×57216081² = 6547359849997122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57216083) 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 15 ways as a sum of consecutive naturals, for example, 2085 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (5180616).

Almost surely, 2^57216081 is an apocalyptic number.

It is an amenable number.

57216081 is a deficient number, since it is larger than the sum of its proper divisors (25673775).

57216081 is a wasteful number, since it uses less digits than its factorization.

57216081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13112.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 57216081 is about 7564.1312125055. The cubic root of 57216081 is about 385.3358086596.

It can be divided in two parts, 572 and 16081, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 57216081 in words is "fifty-seven million, two hundred sixteen thousand, eighty-one".