2091699473 has 2 divisors, whose sum is σ = 2091699474. Its totient is φ = 2091699472.

The previous prime is 2091699437. The next prime is 2091699481. The reversal of 2091699473 is 3749961902.

Together with previous prime (2091699437) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836722449 + 254977024 = 42857^2 + 15968^2 .

It is a cyclic number.

It is not a de Polignac number, because 2091699473 - 2⁶ = 2091699409 is a prime.

It is not a weakly prime, because it can be changed into another prime (2091699403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045849736 + 1045849737.

It is an arithmetic number, because the mean of its divisors is an integer number (1045849737).

Almost surely, 2^2091699473 is an apocalyptic number.

It is an amenable number.

2091699473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091699473 is an equidigital number, since it uses as much as digits as its factorization.

2091699473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 2091699473 is about 45735.1011040754. The cubic root of 2091699473 is about 1278.8897177527.

The spelling of 2091699473 in words is "two billion, ninety-one million, six hundred ninety-nine thousand, four hundred seventy-three".