996756581 has 2 divisors, whose sum is σ = 996756582. Its totient is φ = 996756580.

The previous prime is 996756557. The next prime is 996756583. The reversal of 996756581 is 185657699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568059556 + 428697025 = 23834^2 + 20705^2 .

It is an emirp because it is prime and its reverse (185657699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 996756581 - 2⁶ = 996756517 is a prime.

It is a super-2 number, since 2×996756581² = 1987047363533619122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 996756583, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996756583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498378290 + 498378291.

It is an arithmetic number, because the mean of its divisors is an integer number (498378291).

Almost surely, 2^996756581 is an apocalyptic number.

It is an amenable number.

996756581 is a deficient number, since it is larger than the sum of its proper divisors (1).

996756581 is an equidigital number, since it uses as much as digits as its factorization.

996756581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 56.

The square root of 996756581 is about 31571.4519938504. The cubic root of 996756581 is about 998.9176893596.

The spelling of 996756581 in words is "nine hundred ninety-six million, seven hundred fifty-six thousand, five hundred eighty-one".