782161993 has 12 divisors (see below), whose sum is σ = 838643220. Its totient is φ = 726868736.

The previous prime is 782161973. The next prime is 782162009. The reversal of 782161993 is 399161287.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 376864569 + 405297424 = 19413^2 + 20132^2 .

It is not a de Polignac number, because 782161993 - 2⁹ = 782161481 is a prime.

It is a super-2 number, since 2×782161993² = 1223554766587464098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (782161903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1087488 + ... + 1088206.

It is an arithmetic number, because the mean of its divisors is an integer number (69886935).

Almost surely, 2^782161993 is an apocalyptic number.

It is an amenable number.

782161993 is a deficient number, since it is larger than the sum of its proper divisors (56481227).

782161993 is an frugal number, since it uses more digits than its factorization.

782161993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 825 counting only the distinct ones).

The product of its digits is 163296, while the sum is 46.

The square root of 782161993 is about 27967.1591871609. The cubic root of 782161993 is about 921.3661151322.

The spelling of 782161993 in words is "seven hundred eighty-two million, one hundred sixty-one thousand, nine hundred ninety-three".