997618999 has 12 divisors (see below), whose sum is σ = 1084002696. Its totient is φ = 917690592.

The previous prime is 997618991. The next prime is 997619003. The reversal of 997618999 is 999816799.

It is not a de Polignac number, because 997618999 - 2³ = 997618991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997618991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39444 + ... + 59590.

It is an arithmetic number, because the mean of its divisors is an integer number (90333558).

Almost surely, 2^997618999 is an apocalyptic number.

997618999 is a deficient number, since it is larger than the sum of its proper divisors (86383697).

997618999 is a wasteful number, since it uses less digits than its factorization.

997618999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20466 (or 20453 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 67.

The square root of 997618999 is about 31585.1072342647. The cubic root of 997618999 is about 999.2057022581.

The spelling of 997618999 in words is "nine hundred ninety-seven million, six hundred eighteen thousand, nine hundred ninety-nine".