997121799 has 32 divisors (see below), whose sum is σ = 1522759680. Its totient is φ = 644565600.

The previous prime is 997121773. The next prime is 997121809.

997121799 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 997121799 - 2²¹ = 995024647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997126799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112674 + ... + 121200.

It is an arithmetic number, because the mean of its divisors is an integer number (47586240).

Almost surely, 2^997121799 is an apocalyptic number.

997121799 is a deficient number, since it is larger than the sum of its proper divisors (525637881).

997121799 is a wasteful number, since it uses less digits than its factorization.

997121799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8668 (or 8662 counting only the distinct ones).

The product of its digits is 642978, while the sum is 54.

The square root of 997121799 is about 31577.2354553086. The cubic root of 997121799 is about 999.0396777430.

The spelling of 997121799 in words is "nine hundred ninety-seven million, one hundred twenty-one thousand, seven hundred ninety-nine".