426213209 has 2 divisors, whose sum is σ = 426213210. Its totient is φ = 426213208.

The previous prime is 426213133. The next prime is 426213251. The reversal of 426213209 is 902312624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278055625 + 148157584 = 16675^2 + 12172^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-426213209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (426213269) 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, 213106604 + 213106605.

It is an arithmetic number, because the mean of its divisors is an integer number (213106605).

Almost surely, 2^426213209 is an apocalyptic number.

It is an amenable number.

426213209 is a deficient number, since it is larger than the sum of its proper divisors (1).

426213209 is an equidigital number, since it uses as much as digits as its factorization.

426213209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 426213209 is about 20644.9317993545. The cubic root of 426213209 is about 752.5620285656.

It can be divided in two parts, 4262 and 13209, that added together give a palindrome (17471).

The spelling of 426213209 in words is "four hundred twenty-six million, two hundred thirteen thousand, two hundred nine".