685275247 has 2 divisors, whose sum is σ = 685275248. Its totient is φ = 685275246.

The previous prime is 685275229. The next prime is 685275251. The reversal of 685275247 is 742572586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685275247 is a prime.

It is a super-2 number, since 2×685275247² = 939204328301822018, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685275197 and 685275206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (685275277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342637623 + 342637624.

It is an arithmetic number, because the mean of its divisors is an integer number (342637624).

Almost surely, 2^685275247 is an apocalyptic number.

685275247 is a deficient number, since it is larger than the sum of its proper divisors (1).

685275247 is an equidigital number, since it uses as much as digits as its factorization.

685275247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 940800, while the sum is 46.

The square root of 685275247 is about 26177.7624521272. The cubic root of 685275247 is about 881.6340365178.

The spelling of 685275247 in words is "six hundred eighty-five million, two hundred seventy-five thousand, two hundred forty-seven".