133212397 has 2 divisors, whose sum is σ = 133212398. Its totient is φ = 133212396.

The previous prime is 133212319. The next prime is 133212419. The reversal of 133212397 is 793212331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131537961 + 1674436 = 11469^2 + 1294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133212397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133212307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66606198 + 66606199.

It is an arithmetic number, because the mean of its divisors is an integer number (66606199).

Almost surely, 2^133212397 is an apocalyptic number.

It is an amenable number.

133212397 is a deficient number, since it is larger than the sum of its proper divisors (1).

133212397 is an equidigital number, since it uses as much as digits as its factorization.

133212397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 31.

The square root of 133212397 is about 11541.7674989579. The cubic root of 133212397 is about 510.7184504517.

The spelling of 133212397 in words is "one hundred thirty-three million, two hundred twelve thousand, three hundred ninety-seven".