133945213 has 2 divisors, whose sum is σ = 133945214. Its totient is φ = 133945212.

The previous prime is 133945199. The next prime is 133945223. The reversal of 133945213 is 312549331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73307844 + 60637369 = 8562^2 + 7787^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133945213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133945223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66972606 + 66972607.

It is an arithmetic number, because the mean of its divisors is an integer number (66972607).

Almost surely, 2^133945213 is an apocalyptic number.

It is an amenable number.

133945213 is a deficient number, since it is larger than the sum of its proper divisors (1).

133945213 is an equidigital number, since it uses as much as digits as its factorization.

133945213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 133945213 is about 11573.4702228848. The cubic root of 133945213 is about 511.6532444687.

The spelling of 133945213 in words is "one hundred thirty-three million, nine hundred forty-five thousand, two hundred thirteen".