2190491291 has 2 divisors, whose sum is σ = 2190491292. Its totient is φ = 2190491290.

The previous prime is 2190491269. The next prime is 2190491321. The reversal of 2190491291 is 1921940912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2190491291 - 2³⁰ = 1116749467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2190491201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095245645 + 1095245646.

It is an arithmetic number, because the mean of its divisors is an integer number (1095245646).

Almost surely, 2^2190491291 is an apocalyptic number.

2190491291 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190491291 is an equidigital number, since it uses as much as digits as its factorization.

2190491291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 2190491291 is about 46802.6846559041. The cubic root of 2190491291 is about 1298.7149611351.

The spelling of 2190491291 in words is "two billion, one hundred ninety million, four hundred ninety-one thousand, two hundred ninety-one".