133501213 has 2 divisors, whose sum is σ = 133501214. Its totient is φ = 133501212.

The previous prime is 133501211. The next prime is 133501241. The reversal of 133501213 is 312105331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133125444 + 375769 = 11538^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 133501213 - 2¹ = 133501211 is a prime.

Together with 133501211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133501211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66750606 + 66750607.

It is an arithmetic number, because the mean of its divisors is an integer number (66750607).

Almost surely, 2^133501213 is an apocalyptic number.

It is an amenable number.

133501213 is a deficient number, since it is larger than the sum of its proper divisors (1).

133501213 is an equidigital number, since it uses as much as digits as its factorization.

133501213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 19.

The square root of 133501213 is about 11554.2724998158. The cubic root of 133501213 is about 511.0872779564.

Adding to 133501213 its reverse (312105331), we get a palindrome (445606544).

The spelling of 133501213 in words is "one hundred thirty-three million, five hundred one thousand, two hundred thirteen".