1442748661 has 2 divisors, whose sum is σ = 1442748662. Its totient is φ = 1442748660.

The previous prime is 1442748589. The next prime is 1442748709. The reversal of 1442748661 is 1668472441.

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., 1167520561 + 275228100 = 34169^2 + 16590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1442748661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1442748161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721374330 + 721374331.

It is an arithmetic number, because the mean of its divisors is an integer number (721374331).

Almost surely, 2^1442748661 is an apocalyptic number.

It is an amenable number.

1442748661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442748661 is an equidigital number, since it uses as much as digits as its factorization.

1442748661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 43.

The square root of 1442748661 is about 37983.5314445616. The cubic root of 1442748661 is about 1129.9612749410.

The spelling of 1442748661 in words is "one billion, four hundred forty-two million, seven hundred forty-eight thousand, six hundred sixty-one".