133748581 has 4 divisors (see below), whose sum is σ = 140788000. Its totient is φ = 126709164.

The previous prime is 133748567. The next prime is 133748591. The reversal of 133748581 is 185847331.

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 133748581 - 2¹¹ = 133746533 is a prime.

It is a super-2 number, since 2×133748581² = 35777365839027122, 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 (133748561) 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, 3519681 + ... + 3519718.

It is an arithmetic number, because the mean of its divisors is an integer number (35197000).

Almost surely, 2^133748581 is an apocalyptic number.

It is an amenable number.

133748581 is a deficient number, since it is larger than the sum of its proper divisors (7039419).

133748581 is an equidigital number, since it uses as much as digits as its factorization.

133748581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7039418.

The product of its digits is 80640, while the sum is 40.

The square root of 133748581 is about 11564.9721573379. The cubic root of 133748581 is about 511.4027523225.

The spelling of 133748581 in words is "one hundred thirty-three million, seven hundred forty-eight thousand, five hundred eighty-one".