996591637 has 2 divisors, whose sum is σ = 996591638. Its totient is φ = 996591636.

The previous prime is 996591623. The next prime is 996591643. The reversal of 996591637 is 736195699.

996591637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609053041 + 387538596 = 24679^2 + 19686^2 .

It is an emirp because it is prime and its reverse (736195699) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-996591637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (996591647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498295818 + 498295819.

It is an arithmetic number, because the mean of its divisors is an integer number (498295819).

Almost surely, 2^996591637 is an apocalyptic number.

It is an amenable number.

996591637 is a deficient number, since it is larger than the sum of its proper divisors (1).

996591637 is an equidigital number, since it uses as much as digits as its factorization.

996591637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 55.

The square root of 996591637 is about 31568.8396524167. The cubic root of 996591637 is about 998.8625857794.

The spelling of 996591637 in words is "nine hundred ninety-six million, five hundred ninety-one thousand, six hundred thirty-seven".