133213397 has 2 divisors, whose sum is σ = 133213398. Its totient is φ = 133213396.

The previous prime is 133213391. The next prime is 133213471. The reversal of 133213397 is 793312331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129367876 + 3845521 = 11374^2 + 1961^2 .

It is a cyclic number.

It is not a de Polignac number, because 133213397 - 2¹² = 133209301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133213391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66606698 + 66606699.

It is an arithmetic number, because the mean of its divisors is an integer number (66606699).

Almost surely, 2^133213397 is an apocalyptic number.

It is an amenable number.

133213397 is a deficient number, since it is larger than the sum of its proper divisors (1).

133213397 is an equidigital number, since it uses as much as digits as its factorization.

133213397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 32.

The square root of 133213397 is about 11541.8108197977. The cubic root of 133213397 is about 510.7197284037.

The spelling of 133213397 in words is "one hundred thirty-three million, two hundred thirteen thousand, three hundred ninety-seven".