681339247 has 2 divisors, whose sum is σ = 681339248. Its totient is φ = 681339246.

The previous prime is 681339229. The next prime is 681339301. The reversal of 681339247 is 742933186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681339247 - 2¹¹ = 681337199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681339227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340669623 + 340669624.

It is an arithmetic number, because the mean of its divisors is an integer number (340669624).

Almost surely, 2^681339247 is an apocalyptic number.

681339247 is a deficient number, since it is larger than the sum of its proper divisors (1).

681339247 is an equidigital number, since it uses as much as digits as its factorization.

681339247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 43.

The square root of 681339247 is about 26102.4758787361. The cubic root of 681339247 is about 879.9428539854.

The spelling of 681339247 in words is "six hundred eighty-one million, three hundred thirty-nine thousand, two hundred forty-seven".