131039221 has 2 divisors, whose sum is σ = 131039222. Its totient is φ = 131039220.

The previous prime is 131039191. The next prime is 131039261. The reversal of 131039221 is 122930131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119574225 + 11464996 = 10935^2 + 3386^2 .

It is an emirp because it is prime and its reverse (122930131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131039221 - 2¹⁷ = 130908149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131039192 and 131039201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131039261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65519610 + 65519611.

It is an arithmetic number, because the mean of its divisors is an integer number (65519611).

Almost surely, 2^131039221 is an apocalyptic number.

It is an amenable number.

131039221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131039221 is an equidigital number, since it uses as much as digits as its factorization.

131039221 is an evil number, because the sum of its binary digits is even.

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

The square root of 131039221 is about 11447.2363913741. The cubic root of 131039221 is about 507.9259881946.

Adding to 131039221 its reverse (122930131), we get a palindrome (253969352).

The spelling of 131039221 in words is "one hundred thirty-one million, thirty-nine thousand, two hundred twenty-one".