996212981 has 2 divisors, whose sum is σ = 996212982. Its totient is φ = 996212980.

The previous prime is 996212933. The next prime is 996213011. The reversal of 996212981 is 189212699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 806048881 + 190164100 = 28391^2 + 13790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-996212981 is a prime.

It is a super-2 number, since 2×996212981² = 1984880607025812722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996212911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498106490 + 498106491.

It is an arithmetic number, because the mean of its divisors is an integer number (498106491).

Almost surely, 2^996212981 is an apocalyptic number.

It is an amenable number.

996212981 is a deficient number, since it is larger than the sum of its proper divisors (1).

996212981 is an equidigital number, since it uses as much as digits as its factorization.

996212981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 996212981 is about 31562.8417763673. The cubic root of 996212981 is about 998.7360634708.

The spelling of 996212981 in words is "nine hundred ninety-six million, two hundred twelve thousand, nine hundred eighty-one".