681586697 has 4 divisors (see below), whose sum is σ = 743549136. Its totient is φ = 619624260.

The previous prime is 681586691. The next prime is 681586721. The reversal of 681586697 is 796685186.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681586697 - 2¹⁴ = 681570313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681586691) 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, 30981203 + ... + 30981224.

It is an arithmetic number, because the mean of its divisors is an integer number (185887284).

Almost surely, 2^681586697 is an apocalyptic number.

It is an amenable number.

681586697 is a deficient number, since it is larger than the sum of its proper divisors (61962439).

681586697 is a wasteful number, since it uses less digits than its factorization.

681586697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61962438.

The product of its digits is 4354560, while the sum is 56.

The square root of 681586697 is about 26107.2154202627. The cubic root of 681586697 is about 880.0493674956.

The spelling of 681586697 in words is "six hundred eighty-one million, five hundred eighty-six thousand, six hundred ninety-seven".