687869269 has 2 divisors, whose sum is σ = 687869270. Its totient is φ = 687869268.

The previous prime is 687869267. The next prime is 687869297. The reversal of 687869269 is 962968786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540562500 + 147306769 = 23250^2 + 12137^2 .

It is a cyclic number.

It is not a de Polignac number, because 687869269 - 2¹ = 687869267 is a prime.

It is a super-2 number, since 2×687869269² = 946328262469188722, which contains 22 as substring.

Together with 687869267, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687869267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343934634 + 343934635.

It is an arithmetic number, because the mean of its divisors is an integer number (343934635).

Almost surely, 2^687869269 is an apocalyptic number.

It is an amenable number.

687869269 is a deficient number, since it is larger than the sum of its proper divisors (1).

687869269 is an equidigital number, since it uses as much as digits as its factorization.

687869269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15676416, while the sum is 61.

The square root of 687869269 is about 26227.2619424903. The cubic root of 687869269 is about 882.7450735121.

The spelling of 687869269 in words is "six hundred eighty-seven million, eight hundred sixty-nine thousand, two hundred sixty-nine".