7081991 has 8 divisors (see below), whose sum is σ = 8156544. Its totient is φ = 6023160.

The previous prime is 7081973. The next prime is 7082011. The reversal of 7081991 is 1991807.

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

It is a cyclic number.

It is not a de Polignac number, because 7081991 - 2¹⁴ = 7065607 is a prime.

It is an Ulam 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 (7081931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2945 + ... + 4778.

It is an arithmetic number, because the mean of its divisors is an integer number (1019568).

Almost surely, 2^7081991 is an apocalyptic number.

7081991 is a deficient number, since it is larger than the sum of its proper divisors (1074553).

7081991 is a wasteful number, since it uses less digits than its factorization.

7081991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 7081991 is about 2661.2010446413. The cubic root of 7081991 is about 192.0370931661.

The spelling of 7081991 in words is "seven million, eighty-one thousand, nine hundred ninety-one".