845651899 has 2 divisors, whose sum is σ = 845651900. Its totient is φ = 845651898.

The previous prime is 845651857. The next prime is 845651959. The reversal of 845651899 is 998156548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 845651899 - 2⁷ = 845651771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (845651809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422825949 + 422825950.

It is an arithmetic number, because the mean of its divisors is an integer number (422825950).

Almost surely, 2^845651899 is an apocalyptic number.

845651899 is a deficient number, since it is larger than the sum of its proper divisors (1).

845651899 is an equidigital number, since it uses as much as digits as its factorization.

845651899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 55.

The square root of 845651899 is about 29080.0945493649. The cubic root of 845651899 is about 945.6502524219.

The spelling of 845651899 in words is "eight hundred forty-five million, six hundred fifty-one thousand, eight hundred ninety-nine".