782389889081 has 4 divisors (see below), whose sum is σ = 783552430452. Its totient is φ = 781227347712.

The previous prime is 782389889069. The next prime is 782389889107. The reversal of 782389889081 is 180988983287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 613872250000 + 168517639081 = 783500^2 + 410509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-782389889081 is a prime.

It is a super-2 number, since 2×782389889081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 782389888996 and 782389889014.

It is not an unprimeable number, because it can be changed into a prime (782389889041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581269676 + ... + 581271021.

It is an arithmetic number, because the mean of its divisors is an integer number (195888107613).

Almost surely, 2^782389889081 is an apocalyptic number.

It is an amenable number.

782389889081 is a deficient number, since it is larger than the sum of its proper divisors (1162541371).

782389889081 is a wasteful number, since it uses less digits than its factorization.

782389889081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162541370.

The product of its (nonzero) digits is 111476736, while the sum is 71.

The spelling of 782389889081 in words is "seven hundred eighty-two billion, three hundred eighty-nine million, eight hundred eighty-nine thousand, eighty-one".