2997991 has 8 divisors (see below), whose sum is σ = 3265200. Its totient is φ = 2741760.

The previous prime is 2997977. The next prime is 2997997. The reversal of 2997991 is 1997992.

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 2997991 - 2⁵ = 2997959 is a prime.

It is a Duffinian number.

2997991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2997997) 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, 2170 + ... + 3271.

It is an arithmetic number, because the mean of its divisors is an integer number (408150).

2^2997991 is an apocalyptic number.

2997991 is a deficient number, since it is larger than the sum of its proper divisors (267209).

2997991 is a wasteful number, since it uses less digits than its factorization.

2997991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5489.

The product of its digits is 91854, while the sum is 46.

The square root of 2997991 is about 1731.4707620979. The cubic root of 2997991 is about 144.1927556262.

Subtracting from 2997991 its reverse (1997992), we obtain a palindrome (999999).

The spelling of 2997991 in words is "two million, nine hundred ninety-seven thousand, nine hundred ninety-one".