405869161 has 2 divisors, whose sum is σ = 405869162. Its totient is φ = 405869160.

The previous prime is 405869159. The next prime is 405869197. The reversal of 405869161 is 161968504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 344325136 + 61544025 = 18556^2 + 7845^2 .

It is a cyclic number.

It is not a de Polignac number, because 405869161 - 2¹ = 405869159 is a prime.

Together with 405869159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (405869141) 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, 202934580 + 202934581.

It is an arithmetic number, because the mean of its divisors is an integer number (202934581).

Almost surely, 2^405869161 is an apocalyptic number.

It is an amenable number.

405869161 is a deficient number, since it is larger than the sum of its proper divisors (1).

405869161 is an equidigital number, since it uses as much as digits as its factorization.

405869161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 405869161 is about 20146.1947027224. The cubic root of 405869161 is about 740.3925121217.

The spelling of 405869161 in words is "four hundred five million, eight hundred sixty-nine thousand, one hundred sixty-one".