831291089 has 4 divisors (see below), whose sum is σ = 836796480. Its totient is φ = 825785700.

The previous prime is 831291079. The next prime is 831291091. The reversal of 831291089 is 980192138.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 831291089 - 2²⁸ = 562855633 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (831291079) 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, 2752469 + ... + 2752770.

It is an arithmetic number, because the mean of its divisors is an integer number (209199120).

Almost surely, 2^831291089 is an apocalyptic number.

It is an amenable number.

831291089 is a deficient number, since it is larger than the sum of its proper divisors (5505391).

831291089 is a wasteful number, since it uses less digits than its factorization.

831291089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5505390.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 831291089 is about 28832.1190515023. The cubic root of 831291089 is about 940.2666698517.

The spelling of 831291089 in words is "eight hundred thirty-one million, two hundred ninety-one thousand, eighty-nine".