2757991 has 4 divisors (see below), whose sum is σ = 2782512. Its totient is φ = 2733472.

The previous prime is 2757917. The next prime is 2758003. The reversal of 2757991 is 1997572.

2757991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 2757991 - 2⁷ = 2757863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2757901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12091 + ... + 12316.

It is an arithmetic number, because the mean of its divisors is an integer number (695628).

2^2757991 is an apocalyptic number.

2757991 is a deficient number, since it is larger than the sum of its proper divisors (24521).

2757991 is a wasteful number, since it uses less digits than its factorization.

2757991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24520.

The product of its digits is 39690, while the sum is 40.

The square root of 2757991 is about 1660.7200245677. The cubic root of 2757991 is about 140.2375389151.

The spelling of 2757991 in words is "two million, seven hundred fifty-seven thousand, nine hundred ninety-one".