781242081 has 8 divisors (see below), whose sum is σ = 1086945600. Its totient is φ = 498183312.

The previous prime is 781242071. The next prime is 781242083. The reversal of 781242081 is 180242187.

It is a happy number.

781242081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 781242081 - 2²¹ = 779144929 is a prime.

It is a super-2 number, since 2×781242081² = 1220678378250421122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (781242083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5661106 + ... + 5661243.

It is an arithmetic number, because the mean of its divisors is an integer number (135868200).

Almost surely, 2^781242081 is an apocalyptic number.

It is an amenable number.

781242081 is a deficient number, since it is larger than the sum of its proper divisors (305703519).

781242081 is a wasteful number, since it uses less digits than its factorization.

781242081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11322375.

The product of its (nonzero) digits is 7168, while the sum is 33.

The square root of 781242081 is about 27950.7080590099. The cubic root of 781242081 is about 921.0047627727.

The spelling of 781242081 in words is "seven hundred eighty-one million, two hundred forty-two thousand, eighty-one".