819115139 has 12 divisors (see below), whose sum is σ = 869053248. Its totient is φ = 771228000.

The previous prime is 819115117. The next prime is 819115177. The reversal of 819115139 is 931511918.

It is not a de Polignac number, because 819115139 - 2⁸ = 819114883 is a prime.

It is a super-2 number, since 2×819115139² = 1341899221877978642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (819115189) 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 in 11 ways as a sum of consecutive naturals, for example, 32789 + ... + 52089.

It is an arithmetic number, because the mean of its divisors is an integer number (72421104).

Almost surely, 2^819115139 is an apocalyptic number.

819115139 is a deficient number, since it is larger than the sum of its proper divisors (49938109).

819115139 is a wasteful number, since it uses less digits than its factorization.

819115139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19406 (or 19369 counting only the distinct ones).

The product of its digits is 9720, while the sum is 38.

The square root of 819115139 is about 28620.1876129420. The cubic root of 819115139 is about 935.6533658586.

The spelling of 819115139 in words is "eight hundred nineteen million, one hundred fifteen thousand, one hundred thirty-nine".