681410671 has 2 divisors, whose sum is σ = 681410672. Its totient is φ = 681410670.

The previous prime is 681410591. The next prime is 681410701. The reversal of 681410671 is 176014186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681410671 is a prime.

It is equal to p_35339236 and since 681410671 and 35339236 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681419671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340705335 + 340705336.

It is an arithmetic number, because the mean of its divisors is an integer number (340705336).

Almost surely, 2^681410671 is an apocalyptic number.

681410671 is a deficient number, since it is larger than the sum of its proper divisors (1).

681410671 is an equidigital number, since it uses as much as digits as its factorization.

681410671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 681410671 is about 26103.8439889607. The cubic root of 681410671 is about 879.9736007060.

The spelling of 681410671 in words is "six hundred eighty-one million, four hundred ten thousand, six hundred seventy-one".