869291491 has 8 divisors (see below), whose sum is σ = 897767424. Its totient is φ = 840842760.

The previous prime is 869291473. The next prime is 869291497. The reversal of 869291491 is 194192968.

It is a happy number.

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

It is not a de Polignac number, because 869291491 - 2¹³ = 869283299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869291497) 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, 73320 + ... + 84346.

It is an arithmetic number, because the mean of its divisors is an integer number (112220928).

Almost surely, 2^869291491 is an apocalyptic number.

869291491 is a deficient number, since it is larger than the sum of its proper divisors (28475933).

869291491 is a wasteful number, since it uses less digits than its factorization.

869291491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13601.

The product of its digits is 279936, while the sum is 49.

The square root of 869291491 is about 29483.7496088947. The cubic root of 869291491 is about 954.3810544938.

The spelling of 869291491 in words is "eight hundred sixty-nine million, two hundred ninety-one thousand, four hundred ninety-one".