7066991 has 4 divisors (see below), whose sum is σ = 7096800. Its totient is φ = 7037184.

The previous prime is 7066987. The next prime is 7067017. The reversal of 7066991 is 1996607.

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 7066991 - 2² = 7066987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7066931) 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, 14546 + ... + 15023.

It is an arithmetic number, because the mean of its divisors is an integer number (1774200).

Almost surely, 2^7066991 is an apocalyptic number.

7066991 is a deficient number, since it is larger than the sum of its proper divisors (29809).

7066991 is a wasteful number, since it uses less digits than its factorization.

7066991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29808.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 7066991 is about 2658.3812743848. The cubic root of 7066991 is about 191.9014160421.

The spelling of 7066991 in words is "seven million, sixty-six thousand, nine hundred ninety-one".