864242181 has 48 divisors (see below), whose sum is σ = 1426194432. Its totient is φ = 499197600.

The previous prime is 864242129. The next prime is 864242213. The reversal of 864242181 is 181242468.

864242181 is a `hidden beast` number, since 8 + 642 + 4 + 2 + 1 + 8 + 1 = 666.

It is not a de Polignac number, because 864242181 - 2⁷ = 864242053 is a prime.

It is a super-2 number, since 2×864242181² = 1493829094839273522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864242101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 871596 + ... + 872586.

It is an arithmetic number, because the mean of its divisors is an integer number (29712384).

Almost surely, 2^864242181 is an apocalyptic number.

It is an amenable number.

864242181 is a deficient number, since it is larger than the sum of its proper divisors (561952251).

864242181 is a wasteful number, since it uses less digits than its factorization.

864242181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1411 counting only the distinct ones).

The product of its digits is 24576, while the sum is 36.

The square root of 864242181 is about 29397.9962072247. The cubic root of 864242181 is about 952.5296132319.

The spelling of 864242181 in words is "eight hundred sixty-four million, two hundred forty-two thousand, one hundred eighty-one".