133769581 has 16 divisors (see below), whose sum is σ = 149065920. Its totient is φ = 119025280.

The previous prime is 133769561. The next prime is 133769599. The reversal of 133769581 is 185967331.

It is not a de Polignac number, because 133769581 - 2¹¹ = 133767533 is a prime.

It is a super-2 number, since 2×133769581² = 35788601601831122, 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 (133769561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104115 + ... + 105391.

It is an arithmetic number, because the mean of its divisors is an integer number (9316620).

Almost surely, 2^133769581 is an apocalyptic number.

133769581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

133769581 is a deficient number, since it is larger than the sum of its proper divisors (15296339).

133769581 is a wasteful number, since it uses less digits than its factorization.

133769581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484.

The product of its digits is 136080, while the sum is 43.

The square root of 133769581 is about 11565.8800356912. The cubic root of 133769581 is about 511.4295162096.

The spelling of 133769581 in words is "one hundred thirty-three million, seven hundred sixty-nine thousand, five hundred eighty-one".