431521313 has 4 divisors (see below), whose sum is σ = 432597828. Its totient is φ = 430444800.

The previous prime is 431521309. The next prime is 431521327. The reversal of 431521313 is 313125134.

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 411602944 + 19918369 = 20288^2 + 4463^2 .

It is a cyclic number.

It is not a de Polignac number, because 431521313 - 2² = 431521309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (431521373) 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, 537656 + ... + 538457.

It is an arithmetic number, because the mean of its divisors is an integer number (108149457).

Almost surely, 2^431521313 is an apocalyptic number.

It is an amenable number.

431521313 is a deficient number, since it is larger than the sum of its proper divisors (1076515).

431521313 is a wasteful number, since it uses less digits than its factorization.

431521313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076514.

The product of its digits is 1080, while the sum is 23.

The square root of 431521313 is about 20773.0910795673. The cubic root of 431521313 is about 755.6733101559.

Adding to 431521313 its reverse (313125134), we get a palindrome (744646447).

The spelling of 431521313 in words is "four hundred thirty-one million, five hundred twenty-one thousand, three hundred thirteen".