133532381 has 2 divisors, whose sum is σ = 133532382. Its totient is φ = 133532380.

The previous prime is 133532369. The next prime is 133532401. The reversal of 133532381 is 183235331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68326756 + 65205625 = 8266^2 + 8075^2 .

It is a cyclic number.

It is not a de Polignac number, because 133532381 - 2¹⁰ = 133531357 is a prime.

It is a super-2 number, since 2×133532381² = 35661793551058322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133532341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66766190 + 66766191.

It is an arithmetic number, because the mean of its divisors is an integer number (66766191).

Almost surely, 2^133532381 is an apocalyptic number.

It is an amenable number.

133532381 is a deficient number, since it is larger than the sum of its proper divisors (1).

133532381 is an equidigital number, since it uses as much as digits as its factorization.

133532381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 133532381 is about 11555.6211862452. The cubic root of 133532381 is about 511.1270487031.

The spelling of 133532381 in words is "one hundred thirty-three million, five hundred thirty-two thousand, three hundred eighty-one".