996722989 has 2 divisors, whose sum is σ = 996722990. Its totient is φ = 996722988.

The previous prime is 996722959. The next prime is 996722999. The reversal of 996722989 is 989227699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982320964 + 14402025 = 31342^2 + 3795^2 .

It is a cyclic number.

It is not a de Polignac number, because 996722989 - 2⁹ = 996722477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996722939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498361494 + 498361495.

It is an arithmetic number, because the mean of its divisors is an integer number (498361495).

Almost surely, 2^996722989 is an apocalyptic number.

It is an amenable number.

996722989 is a deficient number, since it is larger than the sum of its proper divisors (1).

996722989 is an equidigital number, since it uses as much as digits as its factorization.

996722989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8817984, while the sum is 61.

The square root of 996722989 is about 31570.9199897627. The cubic root of 996722989 is about 998.9064676228.

The spelling of 996722989 in words is "nine hundred ninety-six million, seven hundred twenty-two thousand, nine hundred eighty-nine".