997038631 has 2 divisors, whose sum is σ = 997038632. Its totient is φ = 997038630.

The previous prime is 997038629. The next prime is 997038641. The reversal of 997038631 is 136830799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997038631 - 2¹ = 997038629 is a prime.

It is a super-2 number, since 2×997038631² = 1988172063412708322, which contains 22 as substring.

Together with 997038629, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997038641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498519315 + 498519316.

It is an arithmetic number, because the mean of its divisors is an integer number (498519316).

Almost surely, 2^997038631 is an apocalyptic number.

997038631 is a deficient number, since it is larger than the sum of its proper divisors (1).

997038631 is an equidigital number, since it uses as much as digits as its factorization.

997038631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 997038631 is about 31575.9185297910. The cubic root of 997038631 is about 999.0119009819.

The spelling of 997038631 in words is "nine hundred ninety-seven million, thirty-eight thousand, six hundred thirty-one".