997299637 has 2 divisors, whose sum is σ = 997299638. Its totient is φ = 997299636.

The previous prime is 997299617. The next prime is 997299643. The reversal of 997299637 is 736992799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 525280561 + 472019076 = 22919^2 + 21726^2 .

It is an emirp because it is prime and its reverse (736992799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997299637 - 2¹⁹ = 996775349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997299617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498649818 + 498649819.

It is an arithmetic number, because the mean of its divisors is an integer number (498649819).

Almost surely, 2^997299637 is an apocalyptic number.

It is an amenable number.

997299637 is a deficient number, since it is larger than the sum of its proper divisors (1).

997299637 is an equidigital number, since it uses as much as digits as its factorization.

997299637 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11573604, while the sum is 61.

The square root of 997299637 is about 31580.0512507501. The cubic root of 997299637 is about 999.0990675645.

The spelling of 997299637 in words is "nine hundred ninety-seven million, two hundred ninety-nine thousand, six hundred thirty-seven".