131021441 has 2 divisors, whose sum is σ = 131021442. Its totient is φ = 131021440.

The previous prime is 131021413. The next prime is 131021447. The reversal of 131021441 is 144120131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130051216 + 970225 = 11404^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 131021441 - 2¹⁸ = 130759297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (131021447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65510720 + 65510721.

It is an arithmetic number, because the mean of its divisors is an integer number (65510721).

Almost surely, 2^131021441 is an apocalyptic number.

It is an amenable number.

131021441 is a deficient number, since it is larger than the sum of its proper divisors (1).

131021441 is an equidigital number, since it uses as much as digits as its factorization.

131021441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 131021441 is about 11446.4597583707. The cubic root of 131021441 is about 507.9030145828.

Adding to 131021441 its reverse (144120131), we get a palindrome (275141572).

The spelling of 131021441 in words is "one hundred thirty-one million, twenty-one thousand, four hundred forty-one".