681348517 has 2 divisors, whose sum is σ = 681348518. Its totient is φ = 681348516.

The previous prime is 681348511. The next prime is 681348553. The reversal of 681348517 is 715843186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514654596 + 166693921 = 22686^2 + 12911^2 .

It is a cyclic number.

It is not a de Polignac number, because 681348517 - 2²⁷ = 547130789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681348511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340674258 + 340674259.

It is an arithmetic number, because the mean of its divisors is an integer number (340674259).

Almost surely, 2^681348517 is an apocalyptic number.

It is an amenable number.

681348517 is a deficient number, since it is larger than the sum of its proper divisors (1).

681348517 is an equidigital number, since it uses as much as digits as its factorization.

681348517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 681348517 is about 26102.6534474946. The cubic root of 681348517 is about 879.9468446715.

It can be divided in two parts, 68134 and 8517, that multiplied together give a triangular number (580297278 = T₃₄₀₆₇).

The spelling of 681348517 in words is "six hundred eighty-one million, three hundred forty-eight thousand, five hundred seventeen".