681108481 has 2 divisors, whose sum is σ = 681108482. Its totient is φ = 681108480.

The previous prime is 681108473. The next prime is 681108487. The reversal of 681108481 is 184801186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 484660225 + 196448256 = 22015^2 + 14016^2 .

It is a cyclic number.

It is not a de Polignac number, because 681108481 - 2³ = 681108473 is a prime.

It is a super-2 number, since 2×681108481² = 927817525780254722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681108481.

It is not a weakly prime, because it can be changed into another prime (681108487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340554240 + 340554241.

It is an arithmetic number, because the mean of its divisors is an integer number (340554241).

Almost surely, 2^681108481 is an apocalyptic number.

It is an amenable number.

681108481 is a deficient number, since it is larger than the sum of its proper divisors (1).

681108481 is an equidigital number, since it uses as much as digits as its factorization.

681108481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 681108481 is about 26098.0551191080. The cubic root of 681108481 is about 879.8434987703.

The spelling of 681108481 in words is "six hundred eighty-one million, one hundred eight thousand, four hundred eighty-one".