681431 has 4 divisors (see below), whose sum is σ = 692664. Its totient is φ = 670200.

The previous prime is 681427. The next prime is 681449. The reversal of 681431 is 134186.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 681431 - 2² = 681427 is a prime.

It is a super-2 number, since 2×681431² = 928696415522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 681397 and 681406.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681431.

It is not an unprimeable number, because it can be changed into a prime (681451) 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, 5525 + ... + 5646.

It is an arithmetic number, because the mean of its divisors is an integer number (173166).

2⁶⁸¹⁴³¹ is an apocalyptic number.

681431 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

681431 is a deficient number, since it is larger than the sum of its proper divisors (11233).

681431 is a wasteful number, since it uses less digits than its factorization.

681431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11232.

The product of its digits is 576, while the sum is 23.

The square root of 681431 is about 825.4883403174. The cubic root of 681431 is about 87.9982351574.

The spelling of 681431 in words is "six hundred eighty-one thousand, four hundred thirty-one".