431221301509 has 2 divisors, whose sum is σ = 431221301510. Its totient is φ = 431221301508.

The previous prime is 431221301389. The next prime is 431221301531. The reversal of 431221301509 is 905103122134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382391350884 + 48829950625 = 618378^2 + 220975^2 .

It is a cyclic number.

It is not a de Polignac number, because 431221301509 - 2²⁵ = 431187747077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431221301909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215610650754 + 215610650755.

It is an arithmetic number, because the mean of its divisors is an integer number (215610650755).

Almost surely, 2^431221301509 is an apocalyptic number.

It is an amenable number.

431221301509 is a deficient number, since it is larger than the sum of its proper divisors (1).

431221301509 is an equidigital number, since it uses as much as digits as its factorization.

431221301509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 431221301509 in words is "four hundred thirty-one billion, two hundred twenty-one million, three hundred one thousand, five hundred nine".