131621033 has 4 divisors (see below), whose sum is σ = 132428688. Its totient is φ = 130813380.

The previous prime is 131620997. The next prime is 131621047. The reversal of 131621033 is 330126131.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 330126131 = 7103 ⋅46477.

It is a cyclic number.

It is not a de Polignac number, because 131621033 - 2⁸ = 131620777 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131620996 and 131621014.

It is not an unprimeable number, because it can be changed into a prime (131623033) 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, 403583 + ... + 403908.

It is an arithmetic number, because the mean of its divisors is an integer number (33107172).

Almost surely, 2^131621033 is an apocalyptic number.

It is an amenable number.

131621033 is a deficient number, since it is larger than the sum of its proper divisors (807655).

131621033 is an equidigital number, since it uses as much as digits as its factorization.

131621033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807654.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 131621033 is about 11472.6210170126. The cubic root of 131621033 is about 508.6766060738.

Adding to 131621033 its reverse (330126131), we get a palindrome (461747164).

The spelling of 131621033 in words is "one hundred thirty-one million, six hundred twenty-one thousand, thirty-three".