2173957091 has 2 divisors, whose sum is σ = 2173957092. Its totient is φ = 2173957090.

The previous prime is 2173957087. The next prime is 2173957099. The reversal of 2173957091 is 1907593712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2173957091 - 2² = 2173957087 is a prime.

It is not a weakly prime, because it can be changed into another prime (2173957099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086978545 + 1086978546.

It is an arithmetic number, because the mean of its divisors is an integer number (1086978546).

Almost surely, 2^2173957091 is an apocalyptic number.

2173957091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173957091 is an equidigital number, since it uses as much as digits as its factorization.

2173957091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 2173957091 is about 46625.7127666699. The cubic root of 2173957091 is about 1295.4390646082.

The spelling of 2173957091 in words is "two billion, one hundred seventy-three million, nine hundred fifty-seven thousand, ninety-one".