431921 has 4 divisors (see below), whose sum is σ = 493632. Its totient is φ = 370212.

The previous prime is 431911. The next prime is 431929. The reversal of 431921 is 129134.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129134 = 2 ⋅64567.

It is a cyclic number.

It is not a de Polignac number, because 431921 - 2⁶ = 431857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 431893 and 431902.

It is not an unprimeable number, because it can be changed into a prime (431929) 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, 30845 + ... + 30858.

It is an arithmetic number, because the mean of its divisors is an integer number (123408).

2⁴³¹⁹²¹ is an apocalyptic number.

It is an amenable number.

431921 is a deficient number, since it is larger than the sum of its proper divisors (61711).

431921 is an equidigital number, since it uses as much as digits as its factorization.

431921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61710.

The product of its digits is 216, while the sum is 20.

The square root of 431921 is about 657.2069689223. The cubic root of 431921 is about 75.5906546682.

The spelling of 431921 in words is "four hundred thirty-one thousand, nine hundred twenty-one".