781532025849 has 15 divisors (see below), whose sum is σ = 1167485652597. Its totient is φ = 521016046308.

The previous prime is 781532025847. The next prime is 781532025881. The reversal of 781532025849 is 948520235187.

The square root of 781532025849 is 884043.

It is a perfect power (a square), and thus also a powerful number.

781532025849 is a `hidden beast` number, since 7 + 8 + 1 + 53 + 2 + 0 + 2 + 584 + 9 = 666.

It is not a de Polignac number, because 781532025849 - 2¹ = 781532025847 is a prime.

It is a super-2 number, since 2×781532025849² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 781532025795 and 781532025804.

It is not an unprimeable number, because it can be changed into a prime (781532025847) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 7907274 + ... + 8005500.

Almost surely, 2^781532025849 is an apocalyptic number.

781532025849 is the 884043-rd square number.

781532025849 is the 442022-nd centered octagonal number.

It is an amenable number.

781532025849 is a deficient number, since it is larger than the sum of its proper divisors (385953626748).

781532025849 is an frugal number, since it uses more digits than its factorization.

781532025849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196466 (or 98230 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 781532025849 in words is "seven hundred eighty-one billion, five hundred thirty-two million, twenty-five thousand, eight hundred forty-nine".