687111757 has 2 divisors, whose sum is σ = 687111758. Its totient is φ = 687111756.

The previous prime is 687111739. The next prime is 687111767. The reversal of 687111757 is 757111786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 539586441 + 147525316 = 23229^2 + 12146^2 .

It is a cyclic number.

It is not a de Polignac number, because 687111757 - 2¹⁵ = 687078989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687111707) 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, 343555878 + 343555879.

It is an arithmetic number, because the mean of its divisors is an integer number (343555879).

Almost surely, 2^687111757 is an apocalyptic number.

It is an amenable number.

687111757 is a deficient number, since it is larger than the sum of its proper divisors (1).

687111757 is an equidigital number, since it uses as much as digits as its factorization.

687111757 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82320, while the sum is 43.

The square root of 687111757 is about 26212.8166552166. The cubic root of 687111757 is about 882.4209152114.

The spelling of 687111757 in words is "six hundred eighty-seven million, one hundred eleven thousand, seven hundred fifty-seven".