7086991 has 4 divisors (see below), whose sum is σ = 7331400. Its totient is φ = 6842584.

The previous prime is 7086983. The next prime is 7086997. The reversal of 7086991 is 1996807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1996807 = 509 ⋅3923.

It is a cyclic number.

It is not a de Polignac number, because 7086991 - 2³ = 7086983 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7086997) 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, 122161 + ... + 122218.

It is an arithmetic number, because the mean of its divisors is an integer number (1832850).

Almost surely, 2^7086991 is an apocalyptic number.

7086991 is a deficient number, since it is larger than the sum of its proper divisors (244409).

7086991 is a wasteful number, since it uses less digits than its factorization.

7086991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244408.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 7086991 is about 2662.1403043416. The cubic root of 7086991 is about 192.0822762973.

The spelling of 7086991 in words is "seven million, eighty-six thousand, nine hundred ninety-one".