864180181 has 4 divisors (see below), whose sum is σ = 864703372. Its totient is φ = 863656992.

The previous prime is 864180179. The next prime is 864180217. The reversal of 864180181 is 181081468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 87721956 + 776458225 = 9366^2 + 27865^2 .

It is a cyclic number.

It is not a de Polignac number, because 864180181 - 2¹ = 864180179 is a prime.

It is a super-2 number, since 2×864180181² = 1493614770466385522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 864180181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864186181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259110 + ... + 262423.

It is an arithmetic number, because the mean of its divisors is an integer number (216175843).

Almost surely, 2^864180181 is an apocalyptic number.

It is an amenable number.

864180181 is a deficient number, since it is larger than the sum of its proper divisors (523191).

864180181 is a wasteful number, since it uses less digits than its factorization.

864180181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523190.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 864180181 is about 29396.9416946729. The cubic root of 864180181 is about 952.5068347987.

The spelling of 864180181 in words is "eight hundred sixty-four million, one hundred eighty thousand, one hundred eighty-one".