691700069 has 2 divisors, whose sum is σ = 691700070. Its totient is φ = 691700068.

The previous prime is 691700057. The next prime is 691700071. The reversal of 691700069 is 960007196.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 419020900 + 272679169 = 20470^2 + 16513^2 .

It is a cyclic number.

It is not a de Polignac number, because 691700069 - 2²⁸ = 423264613 is a prime.

It is a super-2 number, since 2×691700069² = 956897970909209522, which contains 22 as substring.

Together with 691700071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691700869) 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, 345850034 + 345850035.

It is an arithmetic number, because the mean of its divisors is an integer number (345850035).

Almost surely, 2^691700069 is an apocalyptic number.

It is an amenable number.

691700069 is a deficient number, since it is larger than the sum of its proper divisors (1).

691700069 is an equidigital number, since it uses as much as digits as its factorization.

691700069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 691700069 is about 26300.1914251589. The cubic root of 691700069 is about 884.3807339612.

The spelling of 691700069 in words is "six hundred ninety-one million, seven hundred thousand, sixty-nine".