996977381 has 2 divisors, whose sum is σ = 996977382. Its totient is φ = 996977380.

The previous prime is 996977369. The next prime is 996977411. The reversal of 996977381 is 183779699.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 996664900 + 312481 = 31570^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 996977381 - 2¹⁴ = 996960997 is a prime.

It is a super-2 number, since 2×996977381² = 1987927796451238322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 996977381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996977581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498488690 + 498488691.

It is an arithmetic number, because the mean of its divisors is an integer number (498488691).

Almost surely, 2^996977381 is an apocalyptic number.

It is an amenable number.

996977381 is a deficient number, since it is larger than the sum of its proper divisors (1).

996977381 is an equidigital number, since it uses as much as digits as its factorization.

996977381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 59.

The square root of 996977381 is about 31574.9486302037. The cubic root of 996977381 is about 998.9914434891.

The spelling of 996977381 in words is "nine hundred ninety-six million, nine hundred seventy-seven thousand, three hundred eighty-one".