825215899 has 2 divisors, whose sum is σ = 825215900. Its totient is φ = 825215898.

The previous prime is 825215879. The next prime is 825215917. The reversal of 825215899 is 998512528.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 825215899 - 2¹⁵ = 825183131 is a prime.

It is not a weakly prime, because it can be changed into another prime (825215879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412607949 + 412607950.

It is an arithmetic number, because the mean of its divisors is an integer number (412607950).

Almost surely, 2^825215899 is an apocalyptic number.

825215899 is a deficient number, since it is larger than the sum of its proper divisors (1).

825215899 is an equidigital number, since it uses as much as digits as its factorization.

825215899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 49.

The square root of 825215899 is about 28726.5713060226. The cubic root of 825215899 is about 937.9705343814.

The spelling of 825215899 in words is "eight hundred twenty-five million, two hundred fifteen thousand, eight hundred ninety-nine".