691613311 has 2 divisors, whose sum is σ = 691613312. Its totient is φ = 691613310.

The previous prime is 691613269. The next prime is 691613341. The reversal of 691613311 is 113316196.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 691613311 - 2⁷ = 691613183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691613341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345806655 + 345806656.

It is an arithmetic number, because the mean of its divisors is an integer number (345806656).

Almost surely, 2^691613311 is an apocalyptic number.

691613311 is a deficient number, since it is larger than the sum of its proper divisors (1).

691613311 is an equidigital number, since it uses as much as digits as its factorization.

691613311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 31.

The square root of 691613311 is about 26298.5419938064. The cubic root of 691613311 is about 884.3437572834.

The spelling of 691613311 in words is "six hundred ninety-one million, six hundred thirteen thousand, three hundred eleven".