681451117 has 2 divisors, whose sum is σ = 681451118. Its totient is φ = 681451116.

The previous prime is 681451109. The next prime is 681451129. The reversal of 681451117 is 711154186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 523219876 + 158231241 = 22874^2 + 12579^2 .

It is a cyclic number.

It is not a de Polignac number, because 681451117 - 2³ = 681451109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681451187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340725558 + 340725559.

It is an arithmetic number, because the mean of its divisors is an integer number (340725559).

Almost surely, 2^681451117 is an apocalyptic number.

It is an amenable number.

681451117 is a deficient number, since it is larger than the sum of its proper divisors (1).

681451117 is an equidigital number, since it uses as much as digits as its factorization.

681451117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 681451117 is about 26104.6186909520. The cubic root of 681451117 is about 879.9910110136.

The spelling of 681451117 in words is "six hundred eighty-one million, four hundred fifty-one thousand, one hundred seventeen".