7047991 has 4 divisors (see below), whose sum is σ = 7060032. Its totient is φ = 7035952.

The previous prime is 7047977. The next prime is 7048003. The reversal of 7047991 is 1997407.

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

It is a cyclic number.

It is not a de Polignac number, because 7047991 - 2⁷ = 7047863 is a prime.

It is a Duffinian number.

7047991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7047991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7047091) 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, 5095 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (1765008).

Almost surely, 2^7047991 is an apocalyptic number.

7047991 is a deficient number, since it is larger than the sum of its proper divisors (12041).

7047991 is a wasteful number, since it uses less digits than its factorization.

7047991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12040.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 7047991 is about 2654.8052659282. The cubic root of 7047991 is about 191.7292824613.

The spelling of 7047991 in words is "seven million, forty-seven thousand, nine hundred ninety-one".