681413497 has 4 divisors (see below), whose sum is σ = 699830116. Its totient is φ = 662996880.

The previous prime is 681413489. The next prime is 681413501. The reversal of 681413497 is 794314186.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794314186 = 2 ⋅397157093.

It can be written as a sum of positive squares in 2 ways, for example, as 397962601 + 283450896 = 19949^2 + 16836^2 .

It is a cyclic number.

It is not a de Polignac number, because 681413497 - 2³ = 681413489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681413407) 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, 9208254 + ... + 9208327.

It is an arithmetic number, because the mean of its divisors is an integer number (174957529).

Almost surely, 2^681413497 is an apocalyptic number.

It is an amenable number.

681413497 is a deficient number, since it is larger than the sum of its proper divisors (18416619).

681413497 is a wasteful number, since it uses less digits than its factorization.

681413497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18416618.

The product of its digits is 145152, while the sum is 43.

The square root of 681413497 is about 26103.8981188634. The cubic root of 681413497 is about 879.9748172029.

The spelling of 681413497 in words is "six hundred eighty-one million, four hundred thirteen thousand, four hundred ninety-seven".