6991634 has 8 divisors (see below), whose sum is σ = 11294220. Its totient is φ = 3226896.

The previous prime is 6991619. The next prime is 6991657. The reversal of 6991634 is 4361996.

It can be written as a sum of positive squares in 2 ways, for example, as 5040025 + 1951609 = 2245^2 + 1397^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134429 + ... + 134480.

Almost surely, 2^6991634 is an apocalyptic number.

6991634 is a deficient number, since it is larger than the sum of its proper divisors (4302586).

6991634 is a wasteful number, since it uses less digits than its factorization.

6991634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268924.

The product of its digits is 34992, while the sum is 38.

The square root of 6991634 is about 2644.1698130037. The cubic root of 6991634 is about 191.2168803628.

The spelling of 6991634 in words is "six million, nine hundred ninety-one thousand, six hundred thirty-four".