6991330 has 8 divisors (see below), whose sum is σ = 12584412. Its totient is φ = 2796528.

The previous prime is 6991319. The next prime is 6991363. The reversal of 6991330 is 331996.

It can be written as a sum of positive squares in 2 ways, for example, as 6922161 + 69169 = 2631^2 + 263^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 6991292 and 6991301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349557 + ... + 349576.

Almost surely, 2^6991330 is an apocalyptic number.

6991330 is a deficient number, since it is larger than the sum of its proper divisors (5593082).

6991330 is a wasteful number, since it uses less digits than its factorization.

6991330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699140.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 6991330 is about 2644.1123274173. The cubic root of 6991330 is about 191.2141089184.

The spelling of 6991330 in words is "six million, nine hundred ninety-one thousand, three hundred thirty".