33139213 has 2 divisors, whose sum is σ = 33139214. Its totient is φ = 33139212.

The previous prime is 33139163. The next prime is 33139229. The reversal of 33139213 is 31293133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32296489 + 842724 = 5683^2 + 918^2 .

It is a cyclic number.

It is not a de Polignac number, because 33139213 - 2²¹ = 31042061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33139243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16569606 + 16569607.

It is an arithmetic number, because the mean of its divisors is an integer number (16569607).

Almost surely, 2^33139213 is an apocalyptic number.

It is an amenable number.

33139213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33139213 is an equidigital number, since it uses as much as digits as its factorization.

33139213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 25.

The square root of 33139213 is about 5756.6668307277. Note that the first 3 decimals coincide. The cubic root of 33139213 is about 321.2038411174.

The spelling of 33139213 in words is "thirty-three million, one hundred thirty-nine thousand, two hundred thirteen".