431245031421521 has 2 divisors, whose sum is σ = 431245031421522. Its totient is φ = 431245031421520.

The previous prime is 431245031421469. The next prime is 431245031421539. The reversal of 431245031421521 is 125124130542134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274457570031121 + 156787461390400 = 16566761^2 + 12521480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431245031421521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (431245031421121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215622515710760 + 215622515710761.

It is an arithmetic number, because the mean of its divisors is an integer number (215622515710761).

Almost surely, 2^{431245031421521} is an apocalyptic number.

It is an amenable number.

431245031421521 is a deficient number, since it is larger than the sum of its proper divisors (1).

431245031421521 is an equidigital number, since it uses as much as digits as its factorization.

431245031421521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 38.

Adding to 431245031421521 its reverse (125124130542134), we get a palindrome (556369161963655).

The spelling of 431245031421521 in words is "four hundred thirty-one trillion, two hundred forty-five billion, thirty-one million, four hundred twenty-one thousand, five hundred twenty-one".