133693337 has 4 divisors (see below), whose sum is σ = 134169396. Its totient is φ = 133217280.

The previous prime is 133693331. The next prime is 133693349. The reversal of 133693337 is 733396331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 733396331 = 23 ⋅31886797.

It can be written as a sum of positive squares in 2 ways, for example, as 110229001 + 23464336 = 10499^2 + 4844^2 .

It is a cyclic number.

It is not a de Polignac number, because 133693337 - 2¹⁴ = 133676953 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 133693337.

It is not an unprimeable number, because it can be changed into a prime (133693331) 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, 237608 + ... + 238169.

It is an arithmetic number, because the mean of its divisors is an integer number (33542349).

Almost surely, 2^133693337 is an apocalyptic number.

It is an amenable number.

133693337 is a deficient number, since it is larger than the sum of its proper divisors (476059).

133693337 is an equidigital number, since it uses as much as digits as its factorization.

133693337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476058.

The product of its digits is 91854, while the sum is 38.

The square root of 133693337 is about 11562.5834915904. The cubic root of 133693337 is about 511.3323320756.

The spelling of 133693337 in words is "one hundred thirty-three million, six hundred ninety-three thousand, three hundred thirty-seven".