781323481 has 12 divisors (see below), whose sum is σ = 811242432. Its totient is φ = 752473904.

The previous prime is 781323443. The next prime is 781323527. The reversal of 781323481 is 184323187.

It is a de Polignac number, because none of the positive numbers 2^k-781323481 is a prime.

It is a super-2 number, since 2×781323481² = 1220932763923914722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781323481.

It is not an unprimeable number, because it can be changed into a prime (781323181) 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, 422100 + ... + 423946.

It is an arithmetic number, because the mean of its divisors is an integer number (67603536).

Almost surely, 2^781323481 is an apocalyptic number.

It is an amenable number.

781323481 is a deficient number, since it is larger than the sum of its proper divisors (29918951).

781323481 is a wasteful number, since it uses less digits than its factorization.

781323481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2408 (or 2379 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 781323481 is about 27952.1641559290. The cubic root of 781323481 is about 921.0367490955.

The spelling of 781323481 in words is "seven hundred eighty-one million, three hundred twenty-three thousand, four hundred eighty-one".