133752321 has 48 divisors (see below), whose sum is σ = 210462720. Its totient is φ = 81648000.

The previous prime is 133752319. The next prime is 133752323. The reversal of 133752321 is 123257331.

133752321 is a `hidden beast` number, since 1 + 337 + 5 + 2 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (133752319) and next prime (133752323).

It is not a de Polignac number, because 133752321 - 2¹ = 133752319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133752323) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 493416 + ... + 493686.

It is an arithmetic number, because the mean of its divisors is an integer number (4384640).

Almost surely, 2^133752321 is an apocalyptic number.

It is an amenable number.

133752321 is a deficient number, since it is larger than the sum of its proper divisors (76710399).

133752321 is a wasteful number, since it uses less digits than its factorization.

133752321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 395 counting only the distinct ones).

The product of its digits is 3780, while the sum is 27.

The square root of 133752321 is about 11565.1338513655. The cubic root of 133752321 is about 511.4075190484.

The spelling of 133752321 in words is "one hundred thirty-three million, seven hundred fifty-two thousand, three hundred twenty-one".