688212271 has 2 divisors, whose sum is σ = 688212272. Its totient is φ = 688212270.

The previous prime is 688212269. The next prime is 688212313. The reversal of 688212271 is 172212886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688212271 - 2¹ = 688212269 is a prime.

It is a super-2 number, since 2×688212271² = 947272259909954882, which contains 22 as substring.

Together with 688212269, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 688212271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688212251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344106135 + 344106136.

It is an arithmetic number, because the mean of its divisors is an integer number (344106136).

Almost surely, 2^688212271 is an apocalyptic number.

688212271 is a deficient number, since it is larger than the sum of its proper divisors (1).

688212271 is an equidigital number, since it uses as much as digits as its factorization.

688212271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 688212271 is about 26233.8001631483. The cubic root of 688212271 is about 882.8917743588.

The spelling of 688212271 in words is "six hundred eighty-eight million, two hundred twelve thousand, two hundred seventy-one".