132643981 has 2 divisors, whose sum is σ = 132643982. Its totient is φ = 132643980.

The previous prime is 132643957. The next prime is 132644023. The reversal of 132643981 is 189346231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100902025 + 31741956 = 10045^2 + 5634^2 .

It is a cyclic number.

It is not a de Polignac number, because 132643981 - 2¹¹ = 132641933 is a prime.

It is a super-2 number, since 2×132643981² = 35188851391056722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 132643981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (132643781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66321990 + 66321991.

It is an arithmetic number, because the mean of its divisors is an integer number (66321991).

Almost surely, 2^132643981 is an apocalyptic number.

It is an amenable number.

132643981 is a deficient number, since it is larger than the sum of its proper divisors (1).

132643981 is an equidigital number, since it uses as much as digits as its factorization.

132643981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 132643981 is about 11517.1168701199. The cubic root of 132643981 is about 509.9910045831.

The spelling of 132643981 in words is "one hundred thirty-two million, six hundred forty-three thousand, nine hundred eighty-one".