691115011 has 2 divisors, whose sum is σ = 691115012. Its totient is φ = 691115010.

The previous prime is 691115003. The next prime is 691115039. The reversal of 691115011 is 110511196.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691115011 - 2³ = 691115003 is a prime.

It is not a weakly prime, because it can be changed into another prime (691155011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345557505 + 345557506.

It is an arithmetic number, because the mean of its divisors is an integer number (345557506).

Almost surely, 2^691115011 is an apocalyptic number.

691115011 is a deficient number, since it is larger than the sum of its proper divisors (1).

691115011 is an equidigital number, since it uses as much as digits as its factorization.

691115011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 25.

The square root of 691115011 is about 26289.0663774886. The cubic root of 691115011 is about 884.1313195132.

The spelling of 691115011 in words is "six hundred ninety-one million, one hundred fifteen thousand, eleven".