131661332331 has 8 divisors (see below), whose sum is σ = 177358221264. Its totient is φ = 86869332480.

The previous prime is 131661332329. The next prime is 131661332359. The reversal of 131661332331 is 133233166131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131661332331 - 2¹ = 131661332329 is a prime.

It is a super-2 number, since 2×131661332331² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131661332292 and 131661332301.

It is not an unprimeable number, because it can be changed into a prime (131661332311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226221930 + ... + 226222511.

It is an arithmetic number, because the mean of its divisors is an integer number (22169777658).

Almost surely, 2^131661332331 is an apocalyptic number.

131661332331 is a deficient number, since it is larger than the sum of its proper divisors (45696888933).

131661332331 is an equidigital number, since it uses as much as digits as its factorization.

131661332331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452444541.

The product of its digits is 17496, while the sum is 33.

Adding to 131661332331 its reverse (133233166131), we get a palindrome (264894498462).

The spelling of 131661332331 in words is "one hundred thirty-one billion, six hundred sixty-one million, three hundred thirty-two thousand, three hundred thirty-one".