2991091 has 2 divisors, whose sum is σ = 2991092. Its totient is φ = 2991090.

The previous prime is 2991083. The next prime is 2991103. The reversal of 2991091 is 1901992.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2991091 - 2³ = 2991083 is a prime.

It is not a weakly prime, because it can be changed into another prime (2991041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495545 + 1495546.

It is an arithmetic number, because the mean of its divisors is an integer number (1495546).

2^2991091 is an apocalyptic number.

2991091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991091 is an equidigital number, since it uses as much as digits as its factorization.

2991091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 2991091 is about 1729.4770886022. The cubic root of 2991091 is about 144.0820487915.

The spelling of 2991091 in words is "two million, nine hundred ninety-one thousand, ninety-one".