869679891 has 6 divisors (see below), whose sum is σ = 1256204300. Its totient is φ = 579786588.

The previous prime is 869679851. The next prime is 869679901. The reversal of 869679891 is 198976968.

869679891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 869679891 - 2⁶ = 869679827 is a prime.

It is a super-2 number, since 2×869679891² = 1512686225619543762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (869679821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48315541 + ... + 48315558.

Almost surely, 2^869679891 is an apocalyptic number.

869679891 is a deficient number, since it is larger than the sum of its proper divisors (386524409).

869679891 is a wasteful number, since it uses less digits than its factorization.

869679891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96631105 (or 96631102 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 63.

The square root of 869679891 is about 29490.3355525162. The cubic root of 869679891 is about 954.5231726871.

The spelling of 869679891 in words is "eight hundred sixty-nine million, six hundred seventy-nine thousand, eight hundred ninety-one".