691027027 has 2 divisors, whose sum is σ = 691027028. Its totient is φ = 691027026.

The previous prime is 691027013. The next prime is 691027031. The reversal of 691027027 is 720720196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691027027 - 2¹⁵ = 690994259 is a prime.

691027027 is a modest number, since divided by 27027 gives 691 as remainder.

It is equal to p_35812339 and since 691027027 and 35812339 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 691026983 and 691027001.

It is not a weakly prime, because it can be changed into another prime (691027087) 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, 345513513 + 345513514.

It is an arithmetic number, because the mean of its divisors is an integer number (345513514).

Almost surely, 2^691027027 is an apocalyptic number.

691027027 is a deficient number, since it is larger than the sum of its proper divisors (1).

691027027 is an equidigital number, since it uses as much as digits as its factorization.

691027027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 691027027 is about 26287.3929289308. The cubic root of 691027027 is about 884.0937991246.

The spelling of 691027027 in words is "six hundred ninety-one million, twenty-seven thousand, twenty-seven".