681501461 has 2 divisors, whose sum is σ = 681501462. Its totient is φ = 681501460.

The previous prime is 681501433. The next prime is 681501497. The reversal of 681501461 is 164105186.

681501461 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 can be written as a sum of positive squares in only one way, i.e., 439698961 + 241802500 = 20969^2 + 15550^2 .

It is a cyclic number.

It is not a de Polignac number, because 681501461 - 2²² = 677307157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681501761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340750730 + 340750731.

It is an arithmetic number, because the mean of its divisors is an integer number (340750731).

Almost surely, 2^681501461 is an apocalyptic number.

It is an amenable number.

681501461 is a deficient number, since it is larger than the sum of its proper divisors (1).

681501461 is an equidigital number, since it uses as much as digits as its factorization.

681501461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 681501461 is about 26105.5829469483. The cubic root of 681501461 is about 880.0126810328.

The spelling of 681501461 in words is "six hundred eighty-one million, five hundred one thousand, four hundred sixty-one".