681078971 has 2 divisors, whose sum is σ = 681078972. Its totient is φ = 681078970.

The previous prime is 681078961. The next prime is 681078989. The reversal of 681078971 is 179870186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 681078971 - 2⁶ = 681078907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (681078941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340539485 + 340539486.

It is an arithmetic number, because the mean of its divisors is an integer number (340539486).

Almost surely, 2^681078971 is an apocalyptic number.

681078971 is a deficient number, since it is larger than the sum of its proper divisors (1).

681078971 is an equidigital number, since it uses as much as digits as its factorization.

681078971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 681078971 is about 26097.4897451843. The cubic root of 681078971 is about 879.8307917604.

The spelling of 681078971 in words is "six hundred eighty-one million, seventy-eight thousand, nine hundred seventy-one".