791144642 has 6 divisors (see below), whose sum is σ = 1186776633. Its totient is φ = 395552432.

The previous prime is 791144633. The next prime is 791144647. The reversal of 791144642 is 246441197.

It can be written as a sum of positive squares in 2 ways, for example, as 579413041 + 211731601 = 24071^2 + 14551^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=19889.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 791144596 and 791144605.

It is not an unprimeable number, because it can be changed into a prime (791144647) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 29834 + ... + 49722.

Almost surely, 2^791144642 is an apocalyptic number.

791144642 is a deficient number, since it is larger than the sum of its proper divisors (395631991).

791144642 is an frugal number, since it uses more digits than its factorization.

791144642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39780 (or 19891 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 791144642 is about 28127.2935420385. The cubic root of 791144642 is about 924.8798059556.

The spelling of 791144642 in words is "seven hundred ninety-one million, one hundred forty-four thousand, six hundred forty-two".