2730991 has 2 divisors, whose sum is σ = 2730992. Its totient is φ = 2730990.

The previous prime is 2730989. The next prime is 2731013. The reversal of 2730991 is 1990372.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2730991 - 2¹ = 2730989 is a prime.

Together with 2730989, it forms a pair of twin primes.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2730911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365495 + 1365496.

It is an arithmetic number, because the mean of its divisors is an integer number (1365496).

2^2730991 is an apocalyptic number.

2730991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2730991 is an equidigital number, since it uses as much as digits as its factorization.

2730991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 2730991 is about 1652.5710272179. The cubic root of 2730991 is about 139.7784079525.

It can be divided in two parts, 2730 and 991, that added together give a square (3721 = 61²).

The spelling of 2730991 in words is "two million, seven hundred thirty thousand, nine hundred ninety-one".