402565213 has 2 divisors, whose sum is σ = 402565214. Its totient is φ = 402565212.

The previous prime is 402565127. The next prime is 402565223. The reversal of 402565213 is 312565204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360924004 + 41641209 = 18998^2 + 6453^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402565213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402565223) 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, 201282606 + 201282607.

It is an arithmetic number, because the mean of its divisors is an integer number (201282607).

Almost surely, 2^402565213 is an apocalyptic number.

It is an amenable number.

402565213 is a deficient number, since it is larger than the sum of its proper divisors (1).

402565213 is an equidigital number, since it uses as much as digits as its factorization.

402565213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 402565213 is about 20064.0278359057. The cubic root of 402565213 is about 738.3779989636.

Subtracting from 402565213 its reverse (312565204), we obtain a palindrome (90000009).

The spelling of 402565213 in words is "four hundred two million, five hundred sixty-five thousand, two hundred thirteen".