781595678241 has 45 divisors (see below), whose sum is σ = 1358289131331. Its totient is φ = 446594275008.

The previous prime is 781595678231. The next prime is 781595678251. The reversal of 781595678241 is 142876595187.

The square root of 781595678241 is 884079.

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

It is an interprime number because it is at equal distance from previous prime (781595678231) and next prime (781595678251).

It can be written as a sum of positive squares in only one way, i.e., 90875117025 + 690720561216 = 301455^2 + 831096^2 .

It is not a de Polignac number, because 781595678241 - 2¹¹ = 781595676193 is a prime.

It is a super-2 number, since 2×781595678241² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (781595678231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 55689961 + ... + 55703993.

Almost surely, 2^781595678241 is an apocalyptic number.

781595678241 is the 884079-th square number.

781595678241 is the 442040-th centered octagonal number.

It is an amenable number.

781595678241 is a deficient number, since it is larger than the sum of its proper divisors (576693453090).

781595678241 is an frugal number, since it uses more digits than its factorization.

781595678241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28092 (or 14043 counting only the distinct ones).

The product of its digits is 33868800, while the sum is 63.

The spelling of 781595678241 in words is "seven hundred eighty-one billion, five hundred ninety-five million, six hundred seventy-eight thousand, two hundred forty-one".