869079491 has 16 divisors (see below), whose sum is σ = 1074041856. Its totient is φ = 686184576.

The previous prime is 869079469. The next prime is 869079517. The reversal of 869079491 is 194970968.

It is a happy number.

It is not a de Polignac number, because 869079491 - 2⁶ = 869079427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869079691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72101 + ... + 83286.

It is an arithmetic number, because the mean of its divisors is an integer number (67127616).

Almost surely, 2^869079491 is an apocalyptic number.

869079491 is a deficient number, since it is larger than the sum of its proper divisors (204962365).

869079491 is a wasteful number, since it uses less digits than its factorization.

869079491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155458.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 869079491 is about 29480.1541888776. The cubic root of 869079491 is about 954.3034643967.

The spelling of 869079491 in words is "eight hundred sixty-nine million, seventy-nine thousand, four hundred ninety-one".