997116091 has 8 divisors (see below), whose sum is σ = 1003242240. Its totient is φ = 991001088.

The previous prime is 997116061. The next prime is 997116103. The reversal of 997116091 is 190611799.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 997116091 - 2⁷ = 997115963 is a prime.

It is a super-2 number, since 2×997116091² = 1988480997862240562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997116031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237670 + ... + 241828.

It is an arithmetic number, because the mean of its divisors is an integer number (125405280).

Almost surely, 2^997116091 is an apocalyptic number.

997116091 is a deficient number, since it is larger than the sum of its proper divisors (6126149).

997116091 is a wasteful number, since it uses less digits than its factorization.

997116091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5573.

The product of its (nonzero) digits is 30618, while the sum is 43.

The square root of 997116091 is about 31577.1450736130. The cubic root of 997116091 is about 999.0377714131.

It can be divided in two parts, 9971 and 16091, that added together give a palindrome (26062).

The spelling of 997116091 in words is "nine hundred ninety-seven million, one hundred sixteen thousand, ninety-one".