133618481 has 4 divisors (see below), whose sum is σ = 133643364. Its totient is φ = 133593600.

The previous prime is 133618427. The next prime is 133618547. The reversal of 133618481 is 184816331.

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 88190881 + 45427600 = 9391^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 133618481 - 2⁶ = 133618417 is a prime.

It is a super-2 number, since 2×133618481² = 35707796929494722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133618781) 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, 680 + ... + 16361.

It is an arithmetic number, because the mean of its divisors is an integer number (33410841).

Almost surely, 2^133618481 is an apocalyptic number.

It is an amenable number.

133618481 is a deficient number, since it is larger than the sum of its proper divisors (24883).

133618481 is an equidigital number, since it uses as much as digits as its factorization.

133618481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24882.

The product of its digits is 13824, while the sum is 35.

The square root of 133618481 is about 11559.3460455166. The cubic root of 133618481 is about 511.2368811980.

The spelling of 133618481 in words is "one hundred thirty-three million, six hundred eighteen thousand, four hundred eighty-one".