431281 has 4 divisors (see below), whose sum is σ = 454000. Its totient is φ = 408564.

The previous prime is 431269. The next prime is 431287. The reversal of 431281 is 182134.

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 431281 - 2⁷ = 431153 is a prime.

It is a super-2 number, since 2×431281² = 372006601922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 22699 = 431281 / (4 + 3 + 1 + 2 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431287) 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, 11331 + ... + 11368.

It is an arithmetic number, because the mean of its divisors is an integer number (113500).

2⁴³¹²⁸¹ is an apocalyptic number.

It is an amenable number.

431281 is a deficient number, since it is larger than the sum of its proper divisors (22719).

431281 is a wasteful number, since it uses less digits than its factorization.

431281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22718.

The product of its digits is 192, while the sum is 19.

The square root of 431281 is about 656.7198794006. The cubic root of 431281 is about 75.5533006664.

The spelling of 431281 in words is "four hundred thirty-one thousand, two hundred eighty-one".