405551369 has 2 divisors, whose sum is σ = 405551370. Its totient is φ = 405551368.

The previous prime is 405551351. The next prime is 405551383. The reversal of 405551369 is 963155504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386515600 + 19035769 = 19660^2 + 4363^2 .

It is a cyclic number.

It is not a de Polignac number, because 405551369 - 2¹² = 405547273 is a prime.

It is a super-2 number, since 2×405551369² = 328943825795548322, which contains 22 as substring.

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 (405551569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202775684 + 202775685.

It is an arithmetic number, because the mean of its divisors is an integer number (202775685).

Almost surely, 2^405551369 is an apocalyptic number.

It is an amenable number.

405551369 is a deficient number, since it is larger than the sum of its proper divisors (1).

405551369 is an equidigital number, since it uses as much as digits as its factorization.

405551369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 405551369 is about 20138.3060111818. The cubic root of 405551369 is about 740.1992213795.

The spelling of 405551369 in words is "four hundred five million, five hundred fifty-one thousand, three hundred sixty-nine".