133888537 has 4 divisors (see below), whose sum is σ = 133948260. Its totient is φ = 133828816.

The previous prime is 133888511. The next prime is 133888561. The reversal of 133888537 is 735888331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70829056 + 63059481 = 8416^2 + 7941^2 .

It is a cyclic number.

It is not a de Polignac number, because 133888537 - 2¹⁵ = 133855769 is a prime.

It is a super-2 number, since 2×133888537² = 35852280680000738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133888837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26362 + ... + 31027.

It is an arithmetic number, because the mean of its divisors is an integer number (33487065).

Almost surely, 2^133888537 is an apocalyptic number.

It is an amenable number.

133888537 is a deficient number, since it is larger than the sum of its proper divisors (59723).

133888537 is an equidigital number, since it uses as much as digits as its factorization.

133888537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59722.

The product of its digits is 483840, while the sum is 46.

The square root of 133888537 is about 11571.0214328727. The cubic root of 133888537 is about 511.5810693118.

The spelling of 133888537 in words is "one hundred thirty-three million, eight hundred eighty-eight thousand, five hundred thirty-seven".