991082697 has 16 divisors (see below), whose sum is σ = 1446682368. Its totient is φ = 598528080.

The previous prime is 991082689. The next prime is 991082699. The reversal of 991082697 is 796280199.

It is a happy number.

991082697 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991082697 - 2³ = 991082689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991082699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43723 + ... + 62400.

It is an arithmetic number, because the mean of its divisors is an integer number (90417648).

Almost surely, 2^991082697 is an apocalyptic number.

It is an amenable number.

991082697 is a deficient number, since it is larger than the sum of its proper divisors (455599671).

991082697 is a wasteful number, since it uses less digits than its factorization.

991082697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106420.

The product of its (nonzero) digits is 489888, while the sum is 51.

The square root of 991082697 is about 31481.4659283840. The cubic root of 991082697 is about 997.0186862680.

The spelling of 991082697 in words is "nine hundred ninety-one million, eighty-two thousand, six hundred ninety-seven".