1304431522521 has 16 divisors (see below), whose sum is σ = 1830824193600. Its totient is φ = 823832088768.

The previous prime is 1304431522519. The next prime is 1304431522547. The reversal of 1304431522521 is 1252251344031.

It is not a de Polignac number, because 1304431522521 - 2¹ = 1304431522519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1304431522571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2402995 + ... + 2895383.

It is an arithmetic number, because the mean of its divisors is an integer number (114426512100).

Almost surely, 2^{1304431522521} is an apocalyptic number.

It is an amenable number.

1304431522521 is a deficient number, since it is larger than the sum of its proper divisors (526392671079).

1304431522521 is a wasteful number, since it uses less digits than its factorization.

1304431522521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538888.

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 1304431522521 its reverse (1252251344031), we get a palindrome (2556682866552).

The spelling of 1304431522521 in words is "one trillion, three hundred four billion, four hundred thirty-one million, five hundred twenty-two thousand, five hundred twenty-one".