997667207 has 2 divisors, whose sum is σ = 997667208. Its totient is φ = 997667206.

The previous prime is 997667191. The next prime is 997667239. The reversal of 997667207 is 702766799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997667207 - 2⁴ = 997667191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997667267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498833603 + 498833604.

It is an arithmetic number, because the mean of its divisors is an integer number (498833604).

Almost surely, 2^997667207 is an apocalyptic number.

997667207 is a deficient number, since it is larger than the sum of its proper divisors (1).

997667207 is an equidigital number, since it uses as much as digits as its factorization.

997667207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 53.

The square root of 997667207 is about 31585.8703695181. The cubic root of 997667207 is about 999.2217968903.

The spelling of 997667207 in words is "nine hundred ninety-seven million, six hundred sixty-seven thousand, two hundred seven".