691734319 has 2 divisors, whose sum is σ = 691734320. Its totient is φ = 691734318.

The previous prime is 691734293. The next prime is 691734343. The reversal of 691734319 is 913437196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691734319 - 2⁵ = 691734287 is a prime.

It is a super-2 number, since 2×691734319² = 956992736164787522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691734389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345867159 + 345867160.

It is an arithmetic number, because the mean of its divisors is an integer number (345867160).

Almost surely, 2^691734319 is an apocalyptic number.

691734319 is a deficient number, since it is larger than the sum of its proper divisors (1).

691734319 is an equidigital number, since it uses as much as digits as its factorization.

691734319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 43.

The square root of 691734319 is about 26300.8425530438. The cubic root of 691734319 is about 884.3953306251.

The spelling of 691734319 in words is "six hundred ninety-one million, seven hundred thirty-four thousand, three hundred nineteen".