131266621 has 4 divisors (see below), whose sum is σ = 131734044. Its totient is φ = 130799200.

The previous prime is 131266613. The next prime is 131266633. The reversal of 131266621 is 126662131.

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 101727396 + 29539225 = 10086^2 + 5435^2 .

It is a cyclic number.

It is not a de Polignac number, because 131266621 - 2³ = 131266613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131266621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131266651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233290 + ... + 233851.

It is an arithmetic number, because the mean of its divisors is an integer number (32933511).

Almost surely, 2^131266621 is an apocalyptic number.

It is an amenable number.

131266621 is a deficient number, since it is larger than the sum of its proper divisors (467423).

131266621 is an equidigital number, since it uses as much as digits as its factorization.

131266621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467422.

The product of its digits is 2592, while the sum is 28.

The square root of 131266621 is about 11457.1646143363. The cubic root of 131266621 is about 508.2196295957.

The spelling of 131266621 in words is "one hundred thirty-one million, two hundred sixty-six thousand, six hundred twenty-one".