405284261 has 2 divisors, whose sum is σ = 405284262. Its totient is φ = 405284260.

The previous prime is 405284249. The next prime is 405284281. The reversal of 405284261 is 162482504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387853636 + 17430625 = 19694^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 405284261 - 2⁶ = 405284197 is a prime.

It is a super-2 number, since 2×405284261² = 328510664428632242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405284281) 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, 202642130 + 202642131.

It is an arithmetic number, because the mean of its divisors is an integer number (202642131).

Almost surely, 2^405284261 is an apocalyptic number.

It is an amenable number.

405284261 is a deficient number, since it is larger than the sum of its proper divisors (1).

405284261 is an equidigital number, since it uses as much as digits as its factorization.

405284261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 405284261 is about 20131.6730800001. The cubic root of 405284261 is about 740.0366800664.

The spelling of 405284261 in words is "four hundred five million, two hundred eighty-four thousand, two hundred sixty-one".