131263221 has 8 divisors (see below), whose sum is σ = 175220704. Its totient is φ = 87407280.

The previous prime is 131263217. The next prime is 131263241. The reversal of 131263221 is 122362131.

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

It is not a de Polignac number, because 131263221 - 2² = 131263217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131263241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22315 + ... + 27576.

It is an arithmetic number, because the mean of its divisors is an integer number (21902588).

Almost surely, 2^131263221 is an apocalyptic number.

It is an amenable number.

131263221 is a deficient number, since it is larger than the sum of its proper divisors (43957483).

131263221 is an equidigital number, since it uses as much as digits as its factorization.

131263221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50771.

The product of its digits is 432, while the sum is 21.

The square root of 131263221 is about 11457.0162346049. The cubic root of 131263221 is about 508.2152416773.

The spelling of 131263221 in words is "one hundred thirty-one million, two hundred sixty-three thousand, two hundred twenty-one".