691000280011 has 2 divisors, whose sum is σ = 691000280012. Its totient is φ = 691000280010.

The previous prime is 691000279997. The next prime is 691000280021. The reversal of 691000280011 is 110082000196.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-691000280011 is a prime.

It is not a weakly prime, because it can be changed into another prime (691000280021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345500140005 + 345500140006.

It is an arithmetic number, because the mean of its divisors is an integer number (345500140006).

Almost surely, 2^691000280011 is an apocalyptic number.

691000280011 is a deficient number, since it is larger than the sum of its proper divisors (1).

691000280011 is an equidigital number, since it uses as much as digits as its factorization.

691000280011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 691000280011 in words is "six hundred ninety-one billion, two hundred eighty thousand, eleven".