2391091 has 2 divisors, whose sum is σ = 2391092. Its totient is φ = 2391090.

The previous prime is 2391089. The next prime is 2391097. The reversal of 2391091 is 1901932.

2391091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2391091 - 2¹ = 2391089 is a prime.

Together with 2391089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2391097) 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 as a sum of consecutive naturals, namely, 1195545 + 1195546.

It is an arithmetic number, because the mean of its divisors is an integer number (1195546).

2^2391091 is an apocalyptic number.

2391091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2391091 is an equidigital number, since it uses as much as digits as its factorization.

2391091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 2391091 is about 1546.3152977320. The cubic root of 2391091 is about 133.7207185441.

The spelling of 2391091 in words is "two million, three hundred ninety-one thousand, ninety-one".