2166454091 has 2 divisors, whose sum is σ = 2166454092. Its totient is φ = 2166454090.

The previous prime is 2166454061. The next prime is 2166454151. The reversal of 2166454091 is 1904546612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166454091 - 2¹⁰ = 2166453067 is a prime.

It is not a weakly prime, because it can be changed into another prime (2166454001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083227045 + 1083227046.

It is an arithmetic number, because the mean of its divisors is an integer number (1083227046).

Almost surely, 2^2166454091 is an apocalyptic number.

2166454091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166454091 is an equidigital number, since it uses as much as digits as its factorization.

2166454091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 2166454091 is about 46545.1833276011. The cubic root of 2166454091 is about 1293.9470261641.

The spelling of 2166454091 in words is "two billion, one hundred sixty-six million, four hundred fifty-four thousand, ninety-one".