431261221 has 4 divisors (see below), whose sum is σ = 453959200. Its totient is φ = 408563244.

The previous prime is 431261209. The next prime is 431261263. The reversal of 431261221 is 122162134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 431261221 - 2⁵ = 431261189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 431261192 and 431261201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431264221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11348961 + ... + 11348998.

It is an arithmetic number, because the mean of its divisors is an integer number (113489800).

Almost surely, 2^431261221 is an apocalyptic number.

It is an amenable number.

431261221 is a deficient number, since it is larger than the sum of its proper divisors (22697979).

431261221 is a wasteful number, since it uses less digits than its factorization.

431261221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22697978.

The product of its digits is 576, while the sum is 22.

The square root of 431261221 is about 20766.8298254693. The cubic root of 431261221 is about 755.5214566415.

The spelling of 431261221 in words is "four hundred thirty-one million, two hundred sixty-one thousand, two hundred twenty-one".