8615981131 has 2 divisors, whose sum is σ = 8615981132. Its totient is φ = 8615981130.

The previous prime is 8615981071. The next prime is 8615981149. The reversal of 8615981131 is 1311895168.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8615981131 - 2²³ = 8607592523 is a prime.

It is a super-2 number, since 2×8615981131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8615987131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4307990565 + 4307990566.

It is an arithmetic number, because the mean of its divisors is an integer number (4307990566).

Almost surely, 2^8615981131 is an apocalyptic number.

8615981131 is a deficient number, since it is larger than the sum of its proper divisors (1).

8615981131 is an equidigital number, since it uses as much as digits as its factorization.

8615981131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 43.

The square root of 8615981131 is about 92822.3094465980. The cubic root of 8615981131 is about 2050.0679042349.

The spelling of 8615981131 in words is "eight billion, six hundred fifteen million, nine hundred eighty-one thousand, one hundred thirty-one".