2698991 has 4 divisors (see below), whose sum is σ = 2706000. Its totient is φ = 2691984.

The previous prime is 2698979. The next prime is 2699009. The reversal of 2698991 is 1998962.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2698991 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 (2698921) 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, 2891 + ... + 3708.

It is an arithmetic number, because the mean of its divisors is an integer number (676500).

2^2698991 is an apocalyptic number.

2698991 is a deficient number, since it is larger than the sum of its proper divisors (7009).

2698991 is an equidigital number, since it uses as much as digits as its factorization.

2698991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7008.

The product of its digits is 69984, while the sum is 44.

The square root of 2698991 is about 1642.8606149032. The cubic root of 2698991 is about 139.2303170578.

The spelling of 2698991 in words is "two million, six hundred ninety-eight thousand, nine hundred ninety-one".