869812079 has 2 divisors, whose sum is σ = 869812080. Its totient is φ = 869812078.

The previous prime is 869812057. The next prime is 869812087. The reversal of 869812079 is 970218968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 869812079 - 2²⁰ = 868763503 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869812019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434906039 + 434906040.

It is an arithmetic number, because the mean of its divisors is an integer number (434906040).

Almost surely, 2^869812079 is an apocalyptic number.

869812079 is a deficient number, since it is larger than the sum of its proper divisors (1).

869812079 is an equidigital number, since it uses as much as digits as its factorization.

869812079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 869812079 is about 29492.5766761740. The cubic root of 869812079 is about 954.5715315212.

The spelling of 869812079 in words is "eight hundred sixty-nine million, eight hundred twelve thousand, seventy-nine".