131221039 has 4 divisors (see below), whose sum is σ = 134013024. Its totient is φ = 128429056.

The previous prime is 131221037. The next prime is 131221061. The reversal of 131221039 is 930122131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 131221039 - 2¹ = 131221037 is a prime.

It is a super-2 number, since 2×131221039² = 34437922152479042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395922 + ... + 1396015.

It is an arithmetic number, because the mean of its divisors is an integer number (33503256).

Almost surely, 2^131221039 is an apocalyptic number.

131221039 is a deficient number, since it is larger than the sum of its proper divisors (2791985).

131221039 is an equidigital number, since it uses as much as digits as its factorization.

131221039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791984.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 131221039 is about 11455.1752059931. The cubic root of 131221039 is about 508.1607967945.

It can be divided in two parts, 13122 and 1039, that added together give a square (14161 = 119²).

The spelling of 131221039 in words is "one hundred thirty-one million, two hundred twenty-one thousand, thirty-nine".