133809373 has 4 divisors (see below), whose sum is σ = 134661820. Its totient is φ = 132956928.

The previous prime is 133809371. The next prime is 133809383. The reversal of 133809373 is 373908331.

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 48191364 + 85618009 = 6942^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 133809373 - 2¹ = 133809371 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133809371) 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, 425988 + ... + 426301.

It is an arithmetic number, because the mean of its divisors is an integer number (33665455).

Almost surely, 2^133809373 is an apocalyptic number.

It is an amenable number.

133809373 is a deficient number, since it is larger than the sum of its proper divisors (852447).

133809373 is an equidigital number, since it uses as much as digits as its factorization.

133809373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852446.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 133809373 is about 11567.6001400463. The cubic root of 133809373 is about 511.4802222710.

The spelling of 133809373 in words is "one hundred thirty-three million, eight hundred nine thousand, three hundred seventy-three".