6991245 has 16 divisors (see below), whose sum is σ = 12429120. Its totient is φ = 3728592.

The previous prime is 6991147. The next prime is 6991253. The reversal of 6991245 is 5421996.

It is not a de Polignac number, because 6991245 - 2¹⁴ = 6974861 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 25759 + ... + 26028.

It is an arithmetic number, because the mean of its divisors is an integer number (776820).

Almost surely, 2^6991245 is an apocalyptic number.

It is an amenable number.

6991245 is a deficient number, since it is larger than the sum of its proper divisors (5437875).

6991245 is a wasteful number, since it uses less digits than its factorization.

6991245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51801 (or 51795 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 6991245 is about 2644.0962539212. The cubic root of 6991245 is about 191.2133339936.

The spelling of 6991245 in words is "six million, nine hundred ninety-one thousand, two hundred forty-five".