6991097 has 4 divisors (see below), whose sum is σ = 7402356. Its totient is φ = 6579840.

The previous prime is 6991093. The next prime is 6991099. The reversal of 6991097 is 7901996.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5400976 + 1590121 = 2324^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991097 - 2² = 6991093 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6991091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205604 + ... + 205637.

It is an arithmetic number, because the mean of its divisors is an integer number (1850589).

Almost surely, 2^6991097 is an apocalyptic number.

It is an amenable number.

6991097 is a deficient number, since it is larger than the sum of its proper divisors (411259).

6991097 is a wasteful number, since it uses less digits than its factorization.

6991097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411258.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 6991097 is about 2644.0682668948. The cubic root of 6991097 is about 191.2119846978.

It can be divided in two parts, 69910 and 97, that added together give a palindrome (70007).

The spelling of 6991097 in words is "six million, nine hundred ninety-one thousand, ninety-seven".