869955899 has 2 divisors, whose sum is σ = 869955900. Its totient is φ = 869955898.

The previous prime is 869955851. The next prime is 869955929. The reversal of 869955899 is 998559968.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 869955899 - 2¹⁶ = 869890363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (869955839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434977949 + 434977950.

It is an arithmetic number, because the mean of its divisors is an integer number (434977950).

Almost surely, 2^869955899 is an apocalyptic number.

869955899 is a deficient number, since it is larger than the sum of its proper divisors (1).

869955899 is an equidigital number, since it uses as much as digits as its factorization.

869955899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62985600, while the sum is 68.

The square root of 869955899 is about 29495.0148160668. The cubic root of 869955899 is about 954.6241401690.

The spelling of 869955899 in words is "eight hundred sixty-nine million, nine hundred fifty-five thousand, eight hundred ninety-nine".