681113473 has 2 divisors, whose sum is σ = 681113474. Its totient is φ = 681113472.

The previous prime is 681113471. The next prime is 681113509. The reversal of 681113473 is 374311186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677665024 + 3448449 = 26032^2 + 1857^2 .

It is a cyclic number.

It is not a de Polignac number, because 681113473 - 2¹ = 681113471 is a prime.

Together with 681113471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (681113471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340556736 + 340556737.

It is an arithmetic number, because the mean of its divisors is an integer number (340556737).

Almost surely, 2^681113473 is an apocalyptic number.

It is an amenable number.

681113473 is a deficient number, since it is larger than the sum of its proper divisors (1).

681113473 is an equidigital number, since it uses as much as digits as its factorization.

681113473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 681113473 is about 26098.1507582434. The cubic root of 681113473 is about 879.8456482899.

The spelling of 681113473 in words is "six hundred eighty-one million, one hundred thirteen thousand, four hundred seventy-three".