405450305509 has 2 divisors, whose sum is σ = 405450305510. Its totient is φ = 405450305508.

The previous prime is 405450305443. The next prime is 405450305587. The reversal of 405450305509 is 905503054504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397344904609 + 8105400900 = 630353^2 + 90030^2 .

It is a cyclic number.

It is not a de Polignac number, because 405450305509 - 2²¹ = 405448208357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405450305599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202725152754 + 202725152755.

It is an arithmetic number, because the mean of its divisors is an integer number (202725152755).

Almost surely, 2^405450305509 is an apocalyptic number.

It is an amenable number.

405450305509 is a deficient number, since it is larger than the sum of its proper divisors (1).

405450305509 is an equidigital number, since it uses as much as digits as its factorization.

405450305509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 40.

The spelling of 405450305509 in words is "four hundred five billion, four hundred fifty million, three hundred five thousand, five hundred nine".