133916537 has 4 divisors (see below), whose sum is σ = 137182836. Its totient is φ = 130650240.

The previous prime is 133916521. The next prime is 133916543. The reversal of 133916537 is 735619331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 735619331 = 67 ⋅10979393.

It can be written as a sum of positive squares in 2 ways, for example, as 2493241 + 131423296 = 1579^2 + 11464^2 .

It is a cyclic number.

It is not a de Polignac number, because 133916537 - 2⁴ = 133916521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133916537.

It is not an unprimeable number, because it can be changed into a prime (133916137) 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, 1633088 + ... + 1633169.

It is an arithmetic number, because the mean of its divisors is an integer number (34295709).

Almost surely, 2^133916537 is an apocalyptic number.

It is an amenable number.

133916537 is a deficient number, since it is larger than the sum of its proper divisors (3266299).

133916537 is an equidigital number, since it uses as much as digits as its factorization.

133916537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3266298.

The product of its digits is 51030, while the sum is 38.

The square root of 133916537 is about 11572.2312887360. The cubic root of 133916537 is about 511.6167290027.

The spelling of 133916537 in words is "one hundred thirty-three million, nine hundred sixteen thousand, five hundred thirty-seven".