2197945091 has 2 divisors, whose sum is σ = 2197945092. Its totient is φ = 2197945090.

The previous prime is 2197945069. The next prime is 2197945111. The reversal of 2197945091 is 1905497912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2197945091 - 2⁶ = 2197945027 is a prime.

It is not a weakly prime, because it can be changed into another prime (2197945391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098972545 + 1098972546.

It is an arithmetic number, because the mean of its divisors is an integer number (1098972546).

Almost surely, 2^2197945091 is an apocalyptic number.

2197945091 is a deficient number, since it is larger than the sum of its proper divisors (1).

2197945091 is an equidigital number, since it uses as much as digits as its factorization.

2197945091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 2197945091 is about 46882.2470771186. The cubic root of 2197945091 is about 1300.1863817583.

The spelling of 2197945091 in words is "two billion, one hundred ninety-seven million, nine hundred forty-five thousand, ninety-one".