691199 has 2 divisors, whose sum is σ = 691200. Its totient is φ = 691198.

The previous prime is 691193. The next prime is 691231. The reversal of 691199 is 991196.

691199 is an esthetic number in base 11, because in such base its adjacent digits differ by 1.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691199 - 2⁴ = 691183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345599 + 345600.

It is an arithmetic number, because the mean of its divisors is an integer number (345600).

2⁶⁹¹¹⁹⁹ is an apocalyptic number.

691199 is a deficient number, since it is larger than the sum of its proper divisors (1).

691199 is an equidigital number, since it uses as much as digits as its factorization.

691199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4374, while the sum is 35.

The square root of 691199 is about 831.3837862263. The cubic root of 691199 is about 88.4167133281.

The spelling of 691199 in words is "six hundred ninety-one thousand, one hundred ninety-nine".