819125899 has 2 divisors, whose sum is σ = 819125900. Its totient is φ = 819125898.

The previous prime is 819125863. The next prime is 819125903. The reversal of 819125899 is 998521918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 819125899 - 2¹⁵ = 819093131 is a prime.

It is not a weakly prime, because it can be changed into another prime (819125809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409562949 + 409562950.

It is an arithmetic number, because the mean of its divisors is an integer number (409562950).

Almost surely, 2^819125899 is an apocalyptic number.

819125899 is a deficient number, since it is larger than the sum of its proper divisors (1).

819125899 is an equidigital number, since it uses as much as digits as its factorization.

819125899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 52.

The square root of 819125899 is about 28620.3755915257. The cubic root of 819125899 is about 935.6574627943.

The spelling of 819125899 in words is "eight hundred nineteen million, one hundred twenty-five thousand, eight hundred ninety-nine".