133825813 has 4 divisors (see below), whose sum is σ = 145991808. Its totient is φ = 121659820.

The previous prime is 133825793. The next prime is 133825817. The reversal of 133825813 is 318528331.

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 a cyclic number.

It is not a de Polignac number, because 133825813 - 2⁹ = 133825301 is a prime.

It is a super-2 number, since 2×133825813² = 35818696450221938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133825817) 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, 6082981 + ... + 6083002.

It is an arithmetic number, because the mean of its divisors is an integer number (36497952).

Almost surely, 2^133825813 is an apocalyptic number.

It is an amenable number.

133825813 is a deficient number, since it is larger than the sum of its proper divisors (12165995).

133825813 is a wasteful number, since it uses less digits than its factorization.

133825813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12165994.

The product of its digits is 17280, while the sum is 34.

The square root of 133825813 is about 11568.3107236969. The cubic root of 133825813 is about 511.5011684631.

The spelling of 133825813 in words is "one hundred thirty-three million, eight hundred twenty-five thousand, eight hundred thirteen".