131221339 has 2 divisors, whose sum is σ = 131221340. Its totient is φ = 131221338.

The previous prime is 131221327. The next prime is 131221379. The reversal of 131221339 is 933122131.

It is a weak prime.

It is an emirp because it is prime and its reverse (933122131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131221339 - 2⁹ = 131220827 is a prime.

It is not a weakly prime, because it can be changed into another prime (131221379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610669 + 65610670.

It is an arithmetic number, because the mean of its divisors is an integer number (65610670).

Almost surely, 2^131221339 is an apocalyptic number.

131221339 is a deficient number, since it is larger than the sum of its proper divisors (1).

131221339 is an equidigital number, since it uses as much as digits as its factorization.

131221339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 25.

The square root of 131221339 is about 11455.1883005038. The cubic root of 131221339 is about 508.1611840497.

The spelling of 131221339 in words is "one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-nine".