691696193 has 2 divisors, whose sum is σ = 691696194. Its totient is φ = 691696192.

The previous prime is 691696171. The next prime is 691696231. The reversal of 691696193 is 391696196.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434639104 + 257057089 = 20848^2 + 16033^2 .

It is a cyclic number.

It is not a de Polignac number, because 691696193 - 2¹⁴ = 691679809 is a prime.

It is not a weakly prime, because it can be changed into another prime (691696123) 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, 345848096 + 345848097.

It is an arithmetic number, because the mean of its divisors is an integer number (345848097).

Almost surely, 2^691696193 is an apocalyptic number.

It is an amenable number.

691696193 is a deficient number, since it is larger than the sum of its proper divisors (1).

691696193 is an equidigital number, since it uses as much as digits as its factorization.

691696193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 50.

The square root of 691696193 is about 26300.1177373790. The cubic root of 691696193 is about 884.3790820573.

The spelling of 691696193 in words is "six hundred ninety-one million, six hundred ninety-six thousand, one hundred ninety-three".