681908701 has 2 divisors, whose sum is σ = 681908702. Its totient is φ = 681908700.

The previous prime is 681908629. The next prime is 681908713. The reversal of 681908701 is 107809186.

681908701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438860601 + 243048100 = 20949^2 + 15590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681908701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681908741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340954350 + 340954351.

It is an arithmetic number, because the mean of its divisors is an integer number (340954351).

Almost surely, 2^681908701 is an apocalyptic number.

It is an amenable number.

681908701 is a deficient number, since it is larger than the sum of its proper divisors (1).

681908701 is an equidigital number, since it uses as much as digits as its factorization.

681908701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 681908701 is about 26113.3816461982. The cubic root of 681908701 is about 880.1879337771.

The spelling of 681908701 in words is "six hundred eighty-one million, nine hundred eight thousand, seven hundred one".