687234269 has 2 divisors, whose sum is σ = 687234270. Its totient is φ = 687234268.

The previous prime is 687234239. The next prime is 687234271. The reversal of 687234269 is 962432786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425927044 + 261307225 = 20638^2 + 16165^2 .

It is a cyclic number.

It is not a de Polignac number, because 687234269 - 2²⁰ = 686185693 is a prime.

It is a super-2 number, since 2×687234269² = 944581880975928722, which contains 22 as substring.

Together with 687234271, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687234239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343617134 + 343617135.

It is an arithmetic number, because the mean of its divisors is an integer number (343617135).

Almost surely, 2^687234269 is an apocalyptic number.

It is an amenable number.

687234269 is a deficient number, since it is larger than the sum of its proper divisors (1).

687234269 is an equidigital number, since it uses as much as digits as its factorization.

687234269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 687234269 is about 26215.1534231635. The cubic root of 687234269 is about 882.4733572998.

The spelling of 687234269 in words is "six hundred eighty-seven million, two hundred thirty-four thousand, two hundred sixty-nine".