996989867 has 2 divisors, whose sum is σ = 996989868. Its totient is φ = 996989866.

The previous prime is 996989813. The next prime is 996989879. The reversal of 996989867 is 768989699.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-996989867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 996989867.

It is not a weakly prime, because it can be changed into another prime (996989167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498494933 + 498494934.

It is an arithmetic number, because the mean of its divisors is an integer number (498494934).

Almost surely, 2^996989867 is an apocalyptic number.

996989867 is a deficient number, since it is larger than the sum of its proper divisors (1).

996989867 is an equidigital number, since it uses as much as digits as its factorization.

996989867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105815808, while the sum is 71.

The square root of 996989867 is about 31575.1463496212. The cubic root of 996989867 is about 998.9956138796.

The spelling of 996989867 in words is "nine hundred ninety-six million, nine hundred eighty-nine thousand, eight hundred sixty-seven".