19775213 has 2 divisors, whose sum is σ = 19775214. Its totient is φ = 19775212.

The previous prime is 19775209. The next prime is 19775221. The reversal of 19775213 is 31257791.

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., 17455684 + 2319529 = 4178^2 + 1523^2 .

It is a cyclic number.

It is not a de Polignac number, because 19775213 - 2² = 19775209 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 (19775513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9887606 + 9887607.

It is an arithmetic number, because the mean of its divisors is an integer number (9887607).

Almost surely, 2^19775213 is an apocalyptic number.

It is an amenable number.

19775213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19775213 is an equidigital number, since it uses as much as digits as its factorization.

19775213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 35.

The square root of 19775213 is about 4446.9329880267. The cubic root of 19775213 is about 270.4209847762.

The spelling of 19775213 in words is "nineteen million, seven hundred seventy-five thousand, two hundred thirteen".