402144305861 has 2 divisors, whose sum is σ = 402144305862. Its totient is φ = 402144305860.

The previous prime is 402144305833. The next prime is 402144305909. The reversal of 402144305861 is 168503441204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334749030625 + 67395275236 = 578575^2 + 259606^2 .

It is a cyclic number.

It is not a de Polignac number, because 402144305861 - 2²² = 402140111557 is a prime.

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 (402144305831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201072152930 + 201072152931.

It is an arithmetic number, because the mean of its divisors is an integer number (201072152931).

Almost surely, 2^402144305861 is an apocalyptic number.

It is an amenable number.

402144305861 is a deficient number, since it is larger than the sum of its proper divisors (1).

402144305861 is an equidigital number, since it uses as much as digits as its factorization.

402144305861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 402144305861 in words is "four hundred two billion, one hundred forty-four million, three hundred five thousand, eight hundred sixty-one".