681565431 has 8 divisors (see below), whose sum is σ = 913367664. Its totient is φ = 452070080.

The previous prime is 681565421. The next prime is 681565433. The reversal of 681565431 is 134565186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681565431 - 2¹⁹ = 681041143 is a prime.

It is a super-2 number, since 2×681565431² = 929062873468431522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681565431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681565433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576030 + ... + 577211.

It is an arithmetic number, because the mean of its divisors is an integer number (114170958).

Almost surely, 2^681565431 is an apocalyptic number.

681565431 is a deficient number, since it is larger than the sum of its proper divisors (231802233).

681565431 is a wasteful number, since it uses less digits than its factorization.

681565431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153441.

The product of its digits is 86400, while the sum is 39.

The square root of 681565431 is about 26106.8081350440. The cubic root of 681565431 is about 880.0402146739.

The spelling of 681565431 in words is "six hundred eighty-one million, five hundred sixty-five thousand, four hundred thirty-one".