431521352161 has 4 divisors (see below), whose sum is σ = 431524561300. Its totient is φ = 431518143024.

The previous prime is 431521352089. The next prime is 431521352179. The reversal of 431521352161 is 161253125134.

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 327234337936 + 104287014225 = 572044^2 + 322935^2 .

It is a cyclic number.

It is not a de Polignac number, because 431521352161 - 2¹⁹ = 431520827873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431521352461) 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, 1393626 + ... + 1674883.

It is an arithmetic number, because the mean of its divisors is an integer number (107881140325).

Almost surely, 2^431521352161 is an apocalyptic number.

It is an amenable number.

431521352161 is a deficient number, since it is larger than the sum of its proper divisors (3209139).

431521352161 is a wasteful number, since it uses less digits than its factorization.

431521352161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209138.

The product of its digits is 21600, while the sum is 34.

Adding to 431521352161 its reverse (161253125134), we get a palindrome (592774477295).

The spelling of 431521352161 in words is "four hundred thirty-one billion, five hundred twenty-one million, three hundred fifty-two thousand, one hundred sixty-one".