431681 has 8 divisors (see below), whose sum is σ = 465120. Its totient is φ = 399168.

The previous prime is 431671. The next prime is 431693. The reversal of 431681 is 186134.

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 431681 - 2⁶ = 431617 is a prime.

It is a super-2 number, since 2×431681² = 372696971522, which contains 22 as substring.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 431681.

It is not an unprimeable number, because it can be changed into a prime (431611) 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, 950 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (58140).

2⁴³¹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

431681 is a deficient number, since it is larger than the sum of its proper divisors (33439).

431681 is a wasteful number, since it uses less digits than its factorization.

431681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463.

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

The square root of 431681 is about 657.0243526689. The cubic root of 431681 is about 75.5766512445.

The spelling of 431681 in words is "four hundred thirty-one thousand, six hundred eighty-one".