681158297 has 4 divisors (see below), whose sum is σ = 697771956. Its totient is φ = 664544640.

The previous prime is 681158281. The next prime is 681158299. The reversal of 681158297 is 792851186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 792851186 = 2 ⋅396425593.

It can be written as a sum of positive squares in 2 ways, for example, as 111429136 + 569729161 = 10556^2 + 23869^2 .

It is a cyclic number.

It is not a de Polignac number, because 681158297 - 2⁴ = 681158281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681158299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8306768 + ... + 8306849.

It is an arithmetic number, because the mean of its divisors is an integer number (174442989).

Almost surely, 2^681158297 is an apocalyptic number.

It is an amenable number.

681158297 is a deficient number, since it is larger than the sum of its proper divisors (16613659).

681158297 is a wasteful number, since it uses less digits than its factorization.

681158297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16613658.

The product of its digits is 241920, while the sum is 47.

The square root of 681158297 is about 26099.0095022781. The cubic root of 681158297 is about 879.8649487138.

The spelling of 681158297 in words is "six hundred eighty-one million, one hundred fifty-eight thousand, two hundred ninety-seven".