813928627891 has 2 divisors, whose sum is σ = 813928627892. Its totient is φ = 813928627890.

The previous prime is 813928627847. The next prime is 813928627957. The reversal of 813928627891 is 198726829318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 813928627891 - 2¹¹ = 813928625843 is a prime.

It is a super-2 number, since 2×813928627891² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (813928627801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406964313945 + 406964313946.

It is an arithmetic number, because the mean of its divisors is an integer number (406964313946).

Almost surely, 2^813928627891 is an apocalyptic number.

813928627891 is a deficient number, since it is larger than the sum of its proper divisors (1).

813928627891 is an equidigital number, since it uses as much as digits as its factorization.

813928627891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 64.

The spelling of 813928627891 in words is "eight hundred thirteen billion, nine hundred twenty-eight million, six hundred twenty-seven thousand, eight hundred ninety-one".