681291829 has 2 divisors, whose sum is σ = 681291830. Its totient is φ = 681291828.

The previous prime is 681291811. The next prime is 681291833. The reversal of 681291829 is 928192186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 680688100 + 603729 = 26090^2 + 777^2 .

It is a cyclic number.

It is not a de Polignac number, because 681291829 - 2⁷ = 681291701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681291869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340645914 + 340645915.

It is an arithmetic number, because the mean of its divisors is an integer number (340645915).

Almost surely, 2^681291829 is an apocalyptic number.

It is an amenable number.

681291829 is a deficient number, since it is larger than the sum of its proper divisors (1).

681291829 is an equidigital number, since it uses as much as digits as its factorization.

681291829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 46.

The square root of 681291829 is about 26101.5675582904. The cubic root of 681291829 is about 879.9224402202.

The spelling of 681291829 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred twenty-nine".