997109791 has 8 divisors (see below), whose sum is σ = 1022842800. Its totient is φ = 971444160.

The previous prime is 997109779. The next prime is 997109801. The reversal of 997109791 is 197901799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-997109791 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 (997209791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13845 + ... + 46753.

It is an arithmetic number, because the mean of its divisors is an integer number (127855350).

Almost surely, 2^997109791 is an apocalyptic number.

997109791 is a deficient number, since it is larger than the sum of its proper divisors (25733009).

997109791 is a wasteful number, since it uses less digits than its factorization.

997109791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33689.

The product of its (nonzero) digits is 321489, while the sum is 52.

The square root of 997109791 is about 31577.0453177621. The cubic root of 997109791 is about 999.0356673615.

The spelling of 997109791 in words is "nine hundred ninety-seven million, one hundred nine thousand, seven hundred ninety-one".