405561799 has 2 divisors, whose sum is σ = 405561800. Its totient is φ = 405561798.

The previous prime is 405561797. The next prime is 405561817. The reversal of 405561799 is 997165504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 405561799 - 2¹ = 405561797 is a prime.

Together with 405561797, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405561797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202780899 + 202780900.

It is an arithmetic number, because the mean of its divisors is an integer number (202780900).

Almost surely, 2^405561799 is an apocalyptic number.

405561799 is a deficient number, since it is larger than the sum of its proper divisors (1).

405561799 is an equidigital number, since it uses as much as digits as its factorization.

405561799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 405561799 is about 20138.5649687360. The cubic root of 405561799 is about 740.2055668244.

The spelling of 405561799 in words is "four hundred five million, five hundred sixty-one thousand, seven hundred ninety-nine".