405065861 has 2 divisors, whose sum is σ = 405065862. Its totient is φ = 405065860.

The previous prime is 405065839. The next prime is 405065867. The reversal of 405065861 is 168560504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387341761 + 17724100 = 19681^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 405065861 - 2⁶ = 405065797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405065867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202532930 + 202532931.

It is an arithmetic number, because the mean of its divisors is an integer number (202532931).

Almost surely, 2^405065861 is an apocalyptic number.

It is an amenable number.

405065861 is a deficient number, since it is larger than the sum of its proper divisors (1).

405065861 is an equidigital number, since it uses as much as digits as its factorization.

405065861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 405065861 is about 20126.2480606794. The cubic root of 405065861 is about 739.9037256052.

The spelling of 405065861 in words is "four hundred five million, sixty-five thousand, eight hundred sixty-one".