133638481 has 8 divisors (see below), whose sum is σ = 136236960. Its totient is φ = 131051232.

The previous prime is 133638397. The next prime is 133638503. The reversal of 133638481 is 184836331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133638481 - 2¹⁵ = 133605713 is a prime.

It is a super-2 number, since 2×133638481² = 35718487207974722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133638481.

It is not an unprimeable number, because it can be changed into a prime (133938481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23581 + ... + 28693.

It is an arithmetic number, because the mean of its divisors is an integer number (17029620).

Almost surely, 2^133638481 is an apocalyptic number.

It is an amenable number.

133638481 is a deficient number, since it is larger than the sum of its proper divisors (2598479).

133638481 is an equidigital number, since it uses as much as digits as its factorization.

133638481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615.

The product of its digits is 41472, while the sum is 37.

The square root of 133638481 is about 11560.2111139892. The cubic root of 133638481 is about 511.2623872195.

The spelling of 133638481 in words is "one hundred thirty-three million, six hundred thirty-eight thousand, four hundred eighty-one".