133731413 has 4 divisors (see below), whose sum is σ = 133979148. Its totient is φ = 133483680.

The previous prime is 133731379. The next prime is 133731421. The reversal of 133731413 is 314137331.

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 41705764 + 92025649 = 6458^2 + 9593^2 .

It is a cyclic number.

It is not a de Polignac number, because 133731413 - 2¹⁶ = 133665877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133731113) 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, 123056 + ... + 124137.

It is an arithmetic number, because the mean of its divisors is an integer number (33494787).

Almost surely, 2^133731413 is an apocalyptic number.

It is an amenable number.

133731413 is a deficient number, since it is larger than the sum of its proper divisors (247735).

133731413 is an equidigital number, since it uses as much as digits as its factorization.

133731413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247734.

The product of its digits is 2268, while the sum is 26.

The square root of 133731413 is about 11564.2298922150. The cubic root of 133731413 is about 511.3808701261.

Adding to 133731413 its reverse (314137331), we get a palindrome (447868744).

The spelling of 133731413 in words is "one hundred thirty-three million, seven hundred thirty-one thousand, four hundred thirteen".