133531441 has 4 divisors (see below), whose sum is σ = 133567092. Its totient is φ = 133495792.

The previous prime is 133531439. The next prime is 133531459. The reversal of 133531441 is 144135331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144135331 = 677 ⋅212903.

It can be written as a sum of positive squares in 2 ways, for example, as 32729841 + 100801600 = 5721^2 + 10040^2 .

It is a cyclic number.

It is not a de Polignac number, because 133531441 - 2¹ = 133531439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133531471) 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, 11446 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (33391773).

Almost surely, 2^133531441 is an apocalyptic number.

It is an amenable number.

133531441 is a deficient number, since it is larger than the sum of its proper divisors (35651).

133531441 is an equidigital number, since it uses as much as digits as its factorization.

133531441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35650.

The product of its digits is 2160, while the sum is 25.

The square root of 133531441 is about 11555.5805133277. The cubic root of 133531441 is about 511.1258493422.

Adding to 133531441 its reverse (144135331), we get a palindrome (277666772).

The spelling of 133531441 in words is "one hundred thirty-three million, five hundred thirty-one thousand, four hundred forty-one".