431395221 has 16 divisors (see below), whose sum is σ = 596034560. Its totient is φ = 277346160.

The previous prime is 431395207. The next prime is 431395231. The reversal of 431395221 is 122593134.

It is not a de Polignac number, because 431395221 - 2¹³ = 431387029 is a prime.

It is a super-2 number, since 2×431395221² = 372203673403277682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431395201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10975 + ... + 31356.

It is an arithmetic number, because the mean of its divisors is an integer number (37252160).

Almost surely, 2^431395221 is an apocalyptic number.

It is an amenable number.

431395221 is a deficient number, since it is larger than the sum of its proper divisors (164639339).

431395221 is a wasteful number, since it uses less digits than its factorization.

431395221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42456.

The product of its digits is 6480, while the sum is 30.

The square root of 431395221 is about 20770.0558737814. The cubic root of 431395221 is about 755.5996995458.

The spelling of 431395221 in words is "four hundred thirty-one million, three hundred ninety-five thousand, two hundred twenty-one".