8135612891 has 8 divisors (see below), whose sum is σ = 9308750304. Its totient is φ = 6965202240.

The previous prime is 8135612867. The next prime is 8135612911. The reversal of 8135612891 is 1982165318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8135612891 - 2⁶ = 8135612827 is a prime.

It is a super-2 number, since 2×8135612891² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8135612801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675290 + ... + 687231.

It is an arithmetic number, because the mean of its divisors is an integer number (1163593788).

Almost surely, 2^8135612891 is an apocalyptic number.

8135612891 is a deficient number, since it is larger than the sum of its proper divisors (1173137413).

8135612891 is a wasteful number, since it uses less digits than its factorization.

8135612891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363381.

The product of its digits is 103680, while the sum is 44.

The square root of 8135612891 is about 90197.6324024084. The cubic root of 8135612891 is about 2011.2378117761.

The spelling of 8135612891 in words is "eight billion, one hundred thirty-five million, six hundred twelve thousand, eight hundred ninety-one".