681940151 has 2 divisors, whose sum is σ = 681940152. Its totient is φ = 681940150.

The previous prime is 681940141. The next prime is 681940163. The reversal of 681940151 is 151049186.

681940151 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681940151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681940121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340970075 + 340970076.

It is an arithmetic number, because the mean of its divisors is an integer number (340970076).

Almost surely, 2^681940151 is an apocalyptic number.

681940151 is a deficient number, since it is larger than the sum of its proper divisors (1).

681940151 is an equidigital number, since it uses as much as digits as its factorization.

681940151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 681940151 is about 26113.9838209339. The cubic root of 681940151 is about 880.2014651511.

The spelling of 681940151 in words is "six hundred eighty-one million, nine hundred forty thousand, one hundred fifty-one".