131265989 has 2 divisors, whose sum is σ = 131265990. Its totient is φ = 131265988.

The previous prime is 131265983. The next prime is 131266033. The reversal of 131265989 is 989562131.

It is a happy number.

It is an a-pointer prime, because the next prime (131266033) can be obtained adding 131265989 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81450625 + 49815364 = 9025^2 + 7058^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131265989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131265983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65632994 + 65632995.

It is an arithmetic number, because the mean of its divisors is an integer number (65632995).

Almost surely, 2^131265989 is an apocalyptic number.

It is an amenable number.

131265989 is a deficient number, since it is larger than the sum of its proper divisors (1).

131265989 is an equidigital number, since it uses as much as digits as its factorization.

131265989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 131265989 is about 11457.1370333081. The cubic root of 131265989 is about 508.2188139649.

It can be divided in two parts, 1312 and 65989, that multiplied together give a palindrome (86577568).

The spelling of 131265989 in words is "one hundred thirty-one million, two hundred sixty-five thousand, nine hundred eighty-nine".