996081689 has 2 divisors, whose sum is σ = 996081690. Its totient is φ = 996081688.

The previous prime is 996081643. The next prime is 996081743. The reversal of 996081689 is 986180699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 630010000 + 366071689 = 25100^2 + 19133^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-996081689 is a prime.

It is a super-2 number, since 2×996081689² = 1984357462322185442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (996581689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498040844 + 498040845.

It is an arithmetic number, because the mean of its divisors is an integer number (498040845).

Almost surely, 2^996081689 is an apocalyptic number.

It is an amenable number.

996081689 is a deficient number, since it is larger than the sum of its proper divisors (1).

996081689 is an equidigital number, since it uses as much as digits as its factorization.

996081689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 996081689 is about 31560.7618570908. The cubic root of 996081689 is about 998.6921867033.

The spelling of 996081689 in words is "nine hundred ninety-six million, eighty-one thousand, six hundred eighty-nine".