133164481 has 4 divisors (see below), whose sum is σ = 133496964. Its totient is φ = 132832000.

The previous prime is 133164469. The next prime is 133164487. The reversal of 133164481 is 184461331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 184461331 = 337 ⋅547363.

It can be written as a sum of positive squares in 2 ways, for example, as 121881600 + 11282881 = 11040^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 133164481 - 2²¹ = 131067329 is a prime.

It is a super-2 number, since 2×133164481² = 35465557999998722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133164487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165640 + ... + 166441.

It is an arithmetic number, because the mean of its divisors is an integer number (33374241).

Almost surely, 2^133164481 is an apocalyptic number.

It is an amenable number.

133164481 is a deficient number, since it is larger than the sum of its proper divisors (332483).

133164481 is an equidigital number, since it uses as much as digits as its factorization.

133164481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332482.

The product of its digits is 6912, while the sum is 31.

The square root of 133164481 is about 11539.6915470042. The cubic root of 133164481 is about 510.6572086040.

The spelling of 133164481 in words is "one hundred thirty-three million, one hundred sixty-four thousand, four hundred eighty-one".