681246751 has 2 divisors, whose sum is σ = 681246752. Its totient is φ = 681246750.

The previous prime is 681246697. The next prime is 681246773. The reversal of 681246751 is 157642186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681246751 - 2⁹ = 681246239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681246781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340623375 + 340623376.

It is an arithmetic number, because the mean of its divisors is an integer number (340623376).

Almost surely, 2^681246751 is an apocalyptic number.

681246751 is a deficient number, since it is larger than the sum of its proper divisors (1).

681246751 is an equidigital number, since it uses as much as digits as its factorization.

681246751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 681246751 is about 26100.7040326502. The cubic root of 681246751 is about 879.9030329623.

The spelling of 681246751 in words is "six hundred eighty-one million, two hundred forty-six thousand, seven hundred fifty-one".