1442681491 has 2 divisors, whose sum is σ = 1442681492. Its totient is φ = 1442681490.

The previous prime is 1442681479. The next prime is 1442681543. The reversal of 1442681491 is 1941862441.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1442681491 - 2⁷ = 1442681363 is a prime.

It is not a weakly prime, because it can be changed into another prime (1442681431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721340745 + 721340746.

It is an arithmetic number, because the mean of its divisors is an integer number (721340746).

Almost surely, 2^1442681491 is an apocalyptic number.

1442681491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442681491 is an equidigital number, since it uses as much as digits as its factorization.

1442681491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 40.

The square root of 1442681491 is about 37982.6472352836. The cubic root of 1442681491 is about 1129.9437388127.

The spelling of 1442681491 in words is "one billion, four hundred forty-two million, six hundred eighty-one thousand, four hundred ninety-one".