997959647 has 2 divisors, whose sum is σ = 997959648. Its totient is φ = 997959646.

The previous prime is 997959623. The next prime is 997959691. The reversal of 997959647 is 746959799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997959647 - 2¹⁴ = 997943263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997952647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498979823 + 498979824.

It is an arithmetic number, because the mean of its divisors is an integer number (498979824).

Almost surely, 2^997959647 is an apocalyptic number.

997959647 is a deficient number, since it is larger than the sum of its proper divisors (1).

997959647 is an equidigital number, since it uses as much as digits as its factorization.

997959647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38578680, while the sum is 65.

The square root of 997959647 is about 31590.4993154588. The cubic root of 997959647 is about 999.3194192483.

The spelling of 997959647 in words is "nine hundred ninety-seven million, nine hundred fifty-nine thousand, six hundred forty-seven".