133835257 has 6 divisors (see below), whose sum is σ = 134619338. Its totient is φ = 133055712.

The previous prime is 133835231. The next prime is 133835269. The reversal of 133835257 is 752538331.

It can be written as a sum of positive squares in only one way, i.e., 131239936 + 2595321 = 11456^2 + 1611^2 .

It is not a de Polignac number, because 133835257 - 2⁷ = 133835129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133835287) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29953 + ... + 34129.

Almost surely, 2^133835257 is an apocalyptic number.

It is an amenable number.

133835257 is a deficient number, since it is larger than the sum of its proper divisors (784081).

133835257 is an frugal number, since it uses more digits than its factorization.

133835257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535 (or 4356 counting only the distinct ones).

The product of its digits is 75600, while the sum is 37.

The square root of 133835257 is about 11568.7189005525. The cubic root of 133835257 is about 511.5132002809.

The spelling of 133835257 in words is "one hundred thirty-three million, eight hundred thirty-five thousand, two hundred fifty-seven".