431111021 has 6 divisors (see below), whose sum is σ = 473865966. Its totient is φ = 391919000.

The previous prime is 431110987. The next prime is 431111033. The reversal of 431111021 is 120111134.

It can be written as a sum of positive squares in only one way, i.e., 387696100 + 43414921 = 19690^2 + 6589^2 .

It is not a de Polignac number, because 431111021 - 2¹⁴ = 431094637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431110987 and 431111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1781330 + ... + 1781571.

It is an arithmetic number, because the mean of its divisors is an integer number (78977661).

Almost surely, 2^431111021 is an apocalyptic number.

It is an amenable number.

431111021 is a deficient number, since it is larger than the sum of its proper divisors (42754945).

431111021 is a wasteful number, since it uses less digits than its factorization.

431111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3562923 (or 3562912 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 431111021 is about 20763.2131665597. The cubic root of 431111021 is about 755.4337352528.

Adding to 431111021 its reverse (120111134), we get a palindrome (551222155).

The spelling of 431111021 in words is "four hundred thirty-one million, one hundred eleven thousand, twenty-one".