681194617 has 2 divisors, whose sum is σ = 681194618. Its totient is φ = 681194616.

The previous prime is 681194587. The next prime is 681194653. The reversal of 681194617 is 716491186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 511257321 + 169937296 = 22611^2 + 13036^2 .

It is a cyclic number.

It is not a de Polignac number, because 681194617 - 2⁷ = 681194489 is a prime.

It is a super-2 number, since 2×681194617² = 928052212459553378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (681194417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340597308 + 340597309.

It is an arithmetic number, because the mean of its divisors is an integer number (340597309).

Almost surely, 2^681194617 is an apocalyptic number.

It is an amenable number.

681194617 is a deficient number, since it is larger than the sum of its proper divisors (1).

681194617 is an equidigital number, since it uses as much as digits as its factorization.

681194617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 681194617 is about 26099.7053048497. The cubic root of 681194617 is about 879.8805868443.

The spelling of 681194617 in words is "six hundred eighty-one million, one hundred ninety-four thousand, six hundred seventeen".