436431221 has 4 divisors (see below), whose sum is σ = 437498700. Its totient is φ = 435363744.

The previous prime is 436431161. The next prime is 436431241. The reversal of 436431221 is 122134634.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122134634 = 2 ⋅61067317.

It can be written as a sum of positive squares in 2 ways, for example, as 232227121 + 204204100 = 15239^2 + 14290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-436431221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (436431241) 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, 533126 + ... + 533943.

It is an arithmetic number, because the mean of its divisors is an integer number (109374675).

Almost surely, 2^436431221 is an apocalyptic number.

It is an amenable number.

436431221 is a deficient number, since it is larger than the sum of its proper divisors (1067479).

436431221 is a wasteful number, since it uses less digits than its factorization.

436431221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067478.

The product of its digits is 3456, while the sum is 26.

The square root of 436431221 is about 20890.9363361243. The cubic root of 436431221 is about 758.5285593677.

Adding to 436431221 its reverse (122134634), we get a palindrome (558565855).

The spelling of 436431221 in words is "four hundred thirty-six million, four hundred thirty-one thousand, two hundred twenty-one".