681513043 has 2 divisors, whose sum is σ = 681513044. Its totient is φ = 681513042.

The previous prime is 681513031. The next prime is 681513047. The reversal of 681513043 is 340315186.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-681513043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 681512996 and 681513014.

It is not a weakly prime, because it can be changed into another prime (681513047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340756521 + 340756522.

It is an arithmetic number, because the mean of its divisors is an integer number (340756522).

Almost surely, 2^681513043 is an apocalyptic number.

681513043 is a deficient number, since it is larger than the sum of its proper divisors (1).

681513043 is an equidigital number, since it uses as much as digits as its factorization.

681513043 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 31.

The square root of 681513043 is about 26105.8047759497. The cubic root of 681513043 is about 880.0176662259.

The spelling of 681513043 in words is "six hundred eighty-one million, five hundred thirteen thousand, forty-three".