431021 has 2 divisors, whose sum is σ = 431022. Its totient is φ = 431020.

The previous prime is 431017. The next prime is 431029. The reversal of 431021 is 120134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 346921 + 84100 = 589^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 431021 - 2² = 431017 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 430993 and 431011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215510 + 215511.

It is an arithmetic number, because the mean of its divisors is an integer number (215511).

2⁴³¹⁰²¹ is an apocalyptic number.

It is an amenable number.

431021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431021 is an equidigital number, since it uses as much as digits as its factorization.

431021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 431021 is about 656.5218960553. The cubic root of 431021 is about 75.5381150473.

Adding to 431021 its reverse (120134), we get a palindrome (551155).

The spelling of 431021 in words is "four hundred thirty-one thousand, twenty-one".