687191311 has 2 divisors, whose sum is σ = 687191312. Its totient is φ = 687191310.

The previous prime is 687191287. The next prime is 687191317. The reversal of 687191311 is 113191786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687191311 - 2¹¹ = 687189263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687191317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343595655 + 343595656.

It is an arithmetic number, because the mean of its divisors is an integer number (343595656).

Almost surely, 2^687191311 is an apocalyptic number.

687191311 is a deficient number, since it is larger than the sum of its proper divisors (1).

687191311 is an equidigital number, since it uses as much as digits as its factorization.

687191311 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 37.

The square root of 687191311 is about 26214.3340750819. The cubic root of 687191311 is about 882.4549695476.

The spelling of 687191311 in words is "six hundred eighty-seven million, one hundred ninety-one thousand, three hundred eleven".