687862261 has 2 divisors, whose sum is σ = 687862262. Its totient is φ = 687862260.

The previous prime is 687862247. The next prime is 687862303. The reversal of 687862261 is 162268786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 528724036 + 159138225 = 22994^2 + 12615^2 .

It is a cyclic number.

It is not a de Polignac number, because 687862261 - 2¹¹ = 687860213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687862361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343931130 + 343931131.

It is an arithmetic number, because the mean of its divisors is an integer number (343931131).

Almost surely, 2^687862261 is an apocalyptic number.

It is an amenable number.

687862261 is a deficient number, since it is larger than the sum of its proper divisors (1).

687862261 is an equidigital number, since it uses as much as digits as its factorization.

687862261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 687862261 is about 26227.1283407086. The cubic root of 687862261 is about 882.7420757048.

The spelling of 687862261 in words is "six hundred eighty-seven million, eight hundred sixty-two thousand, two hundred sixty-one".