2677991 has 4 divisors (see below), whose sum is σ = 2681400. Its totient is φ = 2674584.

The previous prime is 2677973. The next prime is 2678009. The reversal of 2677991 is 1997762.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (2677973) and next prime (2678009).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2677991 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 (2677901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140 + ... + 2318.

It is an arithmetic number, because the mean of its divisors is an integer number (670350).

2^2677991 is an apocalyptic number.

2677991 is a deficient number, since it is larger than the sum of its proper divisors (3409).

2677991 is a wasteful number, since it uses less digits than its factorization.

2677991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3408.

The product of its digits is 47628, while the sum is 41.

The square root of 2677991 is about 1636.4568433051. The cubic root of 2677991 is about 138.8682740129.

The spelling of 2677991 in words is "two million, six hundred seventy-seven thousand, nine hundred ninety-one".