815091295847 has 4 divisors (see below), whose sum is σ = 815509507800. Its totient is φ = 814673083896.

The previous prime is 815091295841. The next prime is 815091295867. The reversal of 815091295847 is 748592190518.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 815091295847 - 2¹⁶ = 815091230311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815091295841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209103053 + ... + 209106950.

It is an arithmetic number, because the mean of its divisors is an integer number (203877376950).

Almost surely, 2^815091295847 is an apocalyptic number.

815091295847 is a deficient number, since it is larger than the sum of its proper divisors (418211953).

815091295847 is a wasteful number, since it uses less digits than its factorization.

815091295847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418211952.

The product of its (nonzero) digits is 7257600, while the sum is 59.

The spelling of 815091295847 in words is "eight hundred fifteen billion, ninety-one million, two hundred ninety-five thousand, eight hundred forty-seven".