691473227 has 2 divisors, whose sum is σ = 691473228. Its totient is φ = 691473226.

The previous prime is 691473203. The next prime is 691473229. The reversal of 691473227 is 722374196.

691473227 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691473227 - 2¹⁰ = 691472203 is a prime.

Together with 691473229, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_35834369 and since 691473227 and 35834369 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (691473229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345736613 + 345736614.

It is an arithmetic number, because the mean of its divisors is an integer number (345736614).

Almost surely, 2^691473227 is an apocalyptic number.

691473227 is a deficient number, since it is larger than the sum of its proper divisors (1).

691473227 is an equidigital number, since it uses as much as digits as its factorization.

691473227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 691473227 is about 26295.8785173647. The cubic root of 691473227 is about 884.2840462793.

The spelling of 691473227 in words is "six hundred ninety-one million, four hundred seventy-three thousand, two hundred twenty-seven".