819960913 has 2 divisors, whose sum is σ = 819960914. Its totient is φ = 819960912.

The previous prime is 819960887. The next prime is 819960989. The reversal of 819960913 is 319069918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 779917329 + 40043584 = 27927^2 + 6328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819960913 is a prime.

It is not a weakly prime, because it can be changed into another prime (819960313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409980456 + 409980457.

It is an arithmetic number, because the mean of its divisors is an integer number (409980457).

Almost surely, 2^819960913 is an apocalyptic number.

It is an amenable number.

819960913 is a deficient number, since it is larger than the sum of its proper divisors (1).

819960913 is an equidigital number, since it uses as much as digits as its factorization.

819960913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 819960913 is about 28634.9596297952. The cubic root of 819960913 is about 935.9752901073.

The spelling of 819960913 in words is "eight hundred nineteen million, nine hundred sixty thousand, nine hundred thirteen".