133803813 has 16 divisors (see below), whose sum is σ = 209595456. Its totient is φ = 74855040.

The previous prime is 133803809. The next prime is 133803823. The reversal of 133803813 is 318308331.

It is not a de Polignac number, because 133803813 - 2² = 133803809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133803823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155520 + ... + 156377.

It is an arithmetic number, because the mean of its divisors is an integer number (13099716).

Almost surely, 2^133803813 is an apocalyptic number.

133803813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

133803813 is a deficient number, since it is larger than the sum of its proper divisors (75791643).

133803813 is a wasteful number, since it uses less digits than its factorization.

133803813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311924.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 133803813 is about 11567.3598111237. The cubic root of 133803813 is about 511.4731378908.

The spelling of 133803813 in words is "one hundred thirty-three million, eight hundred three thousand, eight hundred thirteen".