133809537 has 4 divisors (see below), whose sum is σ = 178412720. Its totient is φ = 89206356.

The previous prime is 133809523. The next prime is 133809541. The reversal of 133809537 is 735908331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 133809537 - 2⁴ = 133809521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133809495 and 133809504.

It is not an unprimeable number, because it can be changed into a prime (133809587) 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, 22301587 + ... + 22301592.

It is an arithmetic number, because the mean of its divisors is an integer number (44603180).

Almost surely, 2^133809537 is an apocalyptic number.

It is an amenable number.

133809537 is a deficient number, since it is larger than the sum of its proper divisors (44603183).

133809537 is an equidigital number, since it uses as much as digits as its factorization.

133809537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44603182.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 133809537 is about 11567.6072288092. The cubic root of 133809537 is about 511.4804312317.

The spelling of 133809537 in words is "one hundred thirty-three million, eight hundred nine thousand, five hundred thirty-seven".