815357390891 has 6 divisors (see below), whose sum is σ = 860529545892. Its totient is φ = 772443843660.

The previous prime is 815357390851. The next prime is 815357390893. The reversal of 815357390891 is 198093753518.

It is a happy number.

It is not a de Polignac number, because 815357390891 - 2¹⁰ = 815357389867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815357390891.

It is not an unprimeable number, because it can be changed into a prime (815357390893) 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, 1129303505 + ... + 1129304226.

It is an arithmetic number, because the mean of its divisors is an integer number (143421590982).

Almost surely, 2^815357390891 is an apocalyptic number.

815357390891 is a deficient number, since it is larger than the sum of its proper divisors (45172155001).

815357390891 is a wasteful number, since it uses less digits than its factorization.

815357390891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258607769 (or 2258607750 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 59.

The spelling of 815357390891 in words is "eight hundred fifteen billion, three hundred fifty-seven million, three hundred ninety thousand, eight hundred ninety-one".