1442644981 has 2 divisors, whose sum is σ = 1442644982. Its totient is φ = 1442644980.

The previous prime is 1442644963. The next prime is 1442645003. The reversal of 1442644981 is 1894462441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1426572900 + 16072081 = 37770^2 + 4009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1442644981 - 2⁵ = 1442644949 is a prime.

It is a super-2 number, since 2×1442644981² = 4162449082408980722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1442644921) 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, 721322490 + 721322491.

It is an arithmetic number, because the mean of its divisors is an integer number (721322491).

Almost surely, 2^1442644981 is an apocalyptic number.

It is an amenable number.

1442644981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442644981 is an equidigital number, since it uses as much as digits as its factorization.

1442644981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 43.

The square root of 1442644981 is about 37982.1666180327. The cubic root of 1442644981 is about 1129.9342068880.

The spelling of 1442644981 in words is "one billion, four hundred forty-two million, six hundred forty-four thousand, nine hundred eighty-one".