431320445 has 4 divisors (see below), whose sum is σ = 517584540. Its totient is φ = 345056352.

The previous prime is 431320441. The next prime is 431320469. The reversal of 431320445 is 544023134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333646756 + 97673689 = 18266^2 + 9883^2 .

It is a cyclic number.

It is not a de Polignac number, because 431320445 - 2² = 431320441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431320441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43132040 + ... + 43132049.

It is an arithmetic number, because the mean of its divisors is an integer number (129396135).

Almost surely, 2^431320445 is an apocalyptic number.

It is an amenable number.

431320445 is a deficient number, since it is larger than the sum of its proper divisors (86264095).

431320445 is an equidigital number, since it uses as much as digits as its factorization.

431320445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86264094.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 431320445 is about 20768.2557043195. The cubic root of 431320445 is about 755.5560396679.

Adding to 431320445 its reverse (544023134), we get a palindrome (975343579).

The spelling of 431320445 in words is "four hundred thirty-one million, three hundred twenty thousand, four hundred forty-five".