431120321 has 4 divisors (see below), whose sum is σ = 432909444. Its totient is φ = 429331200.

The previous prime is 431120311. The next prime is 431120341. The reversal of 431120321 is 123021134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123021134 = 2 ⋅61510567.

It can be written as a sum of positive squares in 2 ways, for example, as 149719696 + 281400625 = 12236^2 + 16775^2 .

It is a cyclic number.

It is not a de Polignac number, because 431120321 - 2¹⁸ = 430858177 is a prime.

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 431120321.

It is not an unprimeable number, because it can be changed into a prime (431120311) 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, 894200 + ... + 894681.

It is an arithmetic number, because the mean of its divisors is an integer number (108227361).

Almost surely, 2^431120321 is an apocalyptic number.

It is an amenable number.

431120321 is a deficient number, since it is larger than the sum of its proper divisors (1789123).

431120321 is a wasteful number, since it uses less digits than its factorization.

431120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789122.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 431120321 is about 20763.4371191284. The cubic root of 431120321 is about 755.4391673286.

Adding to 431120321 its reverse (123021134), we get a palindrome (554141455).

The spelling of 431120321 in words is "four hundred thirty-one million, one hundred twenty thousand, three hundred twenty-one".