133775231 has 8 divisors (see below), whose sum is σ = 138974400. Its totient is φ = 128615200.

The previous prime is 133775209. The next prime is 133775237. The reversal of 133775231 is 132577331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133775231 is a prime.

It is a super-2 number, since 2×133775231² = 35791624858206722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133775237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2720 + ... + 16581.

It is an arithmetic number, because the mean of its divisors is an integer number (17371800).

Almost surely, 2^133775231 is an apocalyptic number.

133775231 is a deficient number, since it is larger than the sum of its proper divisors (5199169).

133775231 is a wasteful number, since it uses less digits than its factorization.

133775231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19569.

The product of its digits is 13230, while the sum is 32.

The square root of 133775231 is about 11566.1242860346. The cubic root of 133775231 is about 511.4367164915.

The spelling of 133775231 in words is "one hundred thirty-three million, seven hundred seventy-five thousand, two hundred thirty-one".