813928477 has 2 divisors, whose sum is σ = 813928478. Its totient is φ = 813928476.

The previous prime is 813928447. The next prime is 813928483. The reversal of 813928477 is 774829318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 535505881 + 278422596 = 23141^2 + 16686^2 .

It is a cyclic number.

It is not a de Polignac number, because 813928477 - 2¹¹ = 813926429 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 813928477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813928447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406964238 + 406964239.

It is an arithmetic number, because the mean of its divisors is an integer number (406964239).

Almost surely, 2^813928477 is an apocalyptic number.

It is an amenable number.

813928477 is a deficient number, since it is larger than the sum of its proper divisors (1).

813928477 is an equidigital number, since it uses as much as digits as its factorization.

813928477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 813928477 is about 28529.4317679129. The cubic root of 813928477 is about 933.6743209711.

The spelling of 813928477 in words is "eight hundred thirteen million, nine hundred twenty-eight thousand, four hundred seventy-seven".