2291491 has 2 divisors, whose sum is σ = 2291492. Its totient is φ = 2291490.

The previous prime is 2291479. The next prime is 2291539. The reversal of 2291491 is 1941922.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2291491 - 2⁵ = 2291459 is a prime.

2291491 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2291591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1145745 + 1145746.

It is an arithmetic number, because the mean of its divisors is an integer number (1145746).

2^2291491 is an apocalyptic number.

2291491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2291491 is an equidigital number, since it uses as much as digits as its factorization.

2291491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 2291491 is about 1513.7671551464. The cubic root of 2291491 is about 131.8376294011.

It can be divided in two parts, 22914 and 91, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 2291491 in words is "two million, two hundred ninety-one thousand, four hundred ninety-one".