991862999 has 2 divisors, whose sum is σ = 991863000. Its totient is φ = 991862998.

The previous prime is 991862953. The next prime is 991863007. The reversal of 991862999 is 999268199.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991862999 - 2²⁸ = 723427543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991862099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495931499 + 495931500.

It is an arithmetic number, because the mean of its divisors is an integer number (495931500).

Almost surely, 2^991862999 is an apocalyptic number.

991862999 is a deficient number, since it is larger than the sum of its proper divisors (1).

991862999 is an equidigital number, since it uses as much as digits as its factorization.

991862999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 62.

The square root of 991862999 is about 31493.8565279008. The cubic root of 991862999 is about 997.2802761413.

The spelling of 991862999 in words is "nine hundred ninety-one million, eight hundred sixty-two thousand, nine hundred ninety-nine".