131533121 has 4 divisors (see below), whose sum is σ = 134014932. Its totient is φ = 129051312.

The previous prime is 131533117. The next prime is 131533123. The reversal of 131533121 is 121335131.

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 55651600 + 75881521 = 7460^2 + 8711^2 .

It is a cyclic number.

It is not a de Polignac number, because 131533121 - 2² = 131533117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131533093 and 131533102.

It is not an unprimeable number, because it can be changed into a prime (131533123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240826 + ... + 1240931.

It is an arithmetic number, because the mean of its divisors is an integer number (33503733).

Almost surely, 2^131533121 is an apocalyptic number.

It is an amenable number.

131533121 is a deficient number, since it is larger than the sum of its proper divisors (2481811).

131533121 is an equidigital number, since it uses as much as digits as its factorization.

131533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481810.

The product of its digits is 270, while the sum is 20.

The square root of 131533121 is about 11468.7889944841. The cubic root of 131533121 is about 508.5633295034.

Adding to 131533121 its reverse (121335131), we get a palindrome (252868252).

The spelling of 131533121 in words is "one hundred thirty-one million, five hundred thirty-three thousand, one hundred twenty-one".