431621 has 2 divisors, whose sum is σ = 431622. Its totient is φ = 431620.

The previous prime is 431617. The next prime is 431657. The reversal of 431621 is 126134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348100 + 83521 = 590^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 431621 - 2² = 431617 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 431621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215810 + 215811.

It is an arithmetic number, because the mean of its divisors is an integer number (215811).

2⁴³¹⁶²¹ is an apocalyptic number.

It is an amenable number.

431621 is a deficient number, since it is larger than the sum of its proper divisors (1).

431621 is an equidigital number, since it uses as much as digits as its factorization.

431621 is an evil number, because the sum of its binary digits is even.

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

The square root of 431621 is about 656.9786906742. The cubic root of 431621 is about 75.5731495776.

Adding to 431621 its reverse (126134), we get a palindrome (557755).

The spelling of 431621 in words is "four hundred thirty-one thousand, six hundred twenty-one".