405320521481 has 2 divisors, whose sum is σ = 405320521482. Its totient is φ = 405320521480.

The previous prime is 405320521447. The next prime is 405320521517. The reversal of 405320521481 is 184125023504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394892844025 + 10427677456 = 628405^2 + 102116^2 .

It is a cyclic number.

It is not a de Polignac number, because 405320521481 - 2²⁶ = 405253412617 is a prime.

It is a super-2 number, since 2×405320521481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (405320521181) 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, 202660260740 + 202660260741.

It is an arithmetic number, because the mean of its divisors is an integer number (202660260741).

Almost surely, 2^405320521481 is an apocalyptic number.

It is an amenable number.

405320521481 is a deficient number, since it is larger than the sum of its proper divisors (1).

405320521481 is an equidigital number, since it uses as much as digits as its factorization.

405320521481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 405320521481 its reverse (184125023504), we get a palindrome (589445544985).

The spelling of 405320521481 in words is "four hundred five billion, three hundred twenty million, five hundred twenty-one thousand, four hundred eighty-one".