402224861 has 2 divisors, whose sum is σ = 402224862. Its totient is φ = 402224860.

The previous prime is 402224857. The next prime is 402224863. The reversal of 402224861 is 168422204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 274399225 + 127825636 = 16565^2 + 11306^2 .

It is a cyclic number.

It is not a de Polignac number, because 402224861 - 2² = 402224857 is a prime.

Together with 402224863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402224863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201112430 + 201112431.

It is an arithmetic number, because the mean of its divisors is an integer number (201112431).

Almost surely, 2^402224861 is an apocalyptic number.

It is an amenable number.

402224861 is a deficient number, since it is larger than the sum of its proper divisors (1).

402224861 is an equidigital number, since it uses as much as digits as its factorization.

402224861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 402224861 is about 20055.5443955032. The cubic root of 402224861 is about 738.1698510847.

The spelling of 402224861 in words is "four hundred two million, two hundred twenty-four thousand, eight hundred sixty-one".