8618311881 has 6 divisors (see below), whose sum is σ = 12448672730. Its totient is φ = 5745541248.

The previous prime is 8618311841. The next prime is 8618311883. The reversal of 8618311881 is 1881138168.

It can be written as a sum of positive squares in only one way, i.e., 8596071225 + 22240656 = 92715^2 + 4716^2 .

It is not a de Polignac number, because 8618311881 - 2⁶ = 8618311817 is a prime.

It is a super-2 number, since 2×8618311881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8618311883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 478795096 + ... + 478795113.

Almost surely, 2^8618311881 is an apocalyptic number.

It is an amenable number.

8618311881 is a deficient number, since it is larger than the sum of its proper divisors (3830360849).

8618311881 is a wasteful number, since it uses less digits than its factorization.

8618311881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957590215 (or 957590212 counting only the distinct ones).

The product of its digits is 73728, while the sum is 45.

The square root of 8618311881 is about 92834.8634996573. The cubic root of 8618311881 is about 2050.2527454388.

The spelling of 8618311881 in words is "eight billion, six hundred eighteen million, three hundred eleven thousand, eight hundred eighty-one".