445231431 has 8 divisors (see below), whose sum is σ = 659602160. Its totient is φ = 296820936.

The previous prime is 445231379. The next prime is 445231459. The reversal of 445231431 is 134132544.

It is a happy number.

It is not a de Polignac number, because 445231431 - 2¹⁹ = 444707143 is a prime.

It is a super-2 number, since 2×445231431² = 396462054300615522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 16490053 = 445231431 / (4 + 4 + 5 + 2 + 3 + 1 + 4 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 445231395 and 445231404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445235431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8245000 + ... + 8245053.

It is an arithmetic number, because the mean of its divisors is an integer number (82450270).

Almost surely, 2^445231431 is an apocalyptic number.

445231431 is a deficient number, since it is larger than the sum of its proper divisors (214370729).

445231431 is a wasteful number, since it uses less digits than its factorization.

445231431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16490062 (or 16490056 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 445231431 is about 21100.5078374905. The cubic root of 445231431 is about 763.5930001234.

Adding to 445231431 its reverse (134132544), we get a palindrome (579363975).

It can be divided in two parts, 44523 and 1431, that added together give a palindrome (45954).

The spelling of 445231431 in words is "four hundred forty-five million, two hundred thirty-one thousand, four hundred thirty-one".