691297193 has 2 divisors, whose sum is σ = 691297194. Its totient is φ = 691297192.

The previous prime is 691297183. The next prime is 691297207. The reversal of 691297193 is 391792196.

691297193 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 386201104 + 305096089 = 19652^2 + 17467^2 .

It is a cyclic number.

It is not a de Polignac number, because 691297193 - 2²⁰ = 690248617 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (691297153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345648596 + 345648597.

It is an arithmetic number, because the mean of its divisors is an integer number (345648597).

Almost surely, 2^691297193 is an apocalyptic number.

It is an amenable number.

691297193 is a deficient number, since it is larger than the sum of its proper divisors (1).

691297193 is an equidigital number, since it uses as much as digits as its factorization.

691297193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 47.

The square root of 691297193 is about 26292.5311257779. The cubic root of 691297193 is about 884.2090001010.

The spelling of 691297193 in words is "six hundred ninety-one million, two hundred ninety-seven thousand, one hundred ninety-three".