691110887 has 2 divisors, whose sum is σ = 691110888. Its totient is φ = 691110886.

The previous prime is 691110859. The next prime is 691110941. The reversal of 691110887 is 788011196.

691110887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 691110887 - 2⁸ = 691110631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (691110857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345555443 + 345555444.

It is an arithmetic number, because the mean of its divisors is an integer number (345555444).

Almost surely, 2^691110887 is an apocalyptic number.

691110887 is a deficient number, since it is larger than the sum of its proper divisors (1).

691110887 is an equidigital number, since it uses as much as digits as its factorization.

691110887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 41.

The square root of 691110887 is about 26288.9879417219. The cubic root of 691110887 is about 884.1295609227.

The spelling of 691110887 in words is "six hundred ninety-one million, one hundred ten thousand, eight hundred eighty-seven".