997637 has 2 divisors, whose sum is σ = 997638. Its totient is φ = 997636.

The previous prime is 997627. The next prime is 997649. The reversal of 997637 is 736799.

997637 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 410881 = 766^2 + 641^2 .

It is a cyclic number.

It is not a de Polignac number, because 997637 - 2⁶ = 997573 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 997594 and 997603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498818 + 498819.

It is an arithmetic number, because the mean of its divisors is an integer number (498819).

2⁹⁹⁷⁶³⁷ is an apocalyptic number.

It is an amenable number.

997637 is a deficient number, since it is larger than the sum of its proper divisors (1).

997637 is an equidigital number, since it uses as much as digits as its factorization.

997637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71442, while the sum is 41.

The square root of 997637 is about 998.8178012030. The cubic root of 997637 is about 99.9211712099.

The spelling of 997637 in words is "nine hundred ninety-seven thousand, six hundred thirty-seven".