431981 has 8 divisors (see below), whose sum is σ = 476064. Its totient is φ = 388720.

The previous prime is 431947. The next prime is 431983. The reversal of 431981 is 189134.

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 431981 - 2¹⁰ = 430957 is a prime.

It is a super-2 number, since 2×431981² = 373215168722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 431981.

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 431981.

It is not an unprimeable number, because it can be changed into a prime (431983) 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, 1790 + ... + 2016.

It is an arithmetic number, because the mean of its divisors is an integer number (59508).

2⁴³¹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

431981 is a deficient number, since it is larger than the sum of its proper divisors (44083).

431981 is a wasteful number, since it uses less digits than its factorization.

431981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411.

The product of its digits is 864, while the sum is 26.

The square root of 431981 is about 657.2526150576. The cubic root of 431981 is about 75.5941547136.

The spelling of 431981 in words is "four hundred thirty-one thousand, nine hundred eighty-one".