994816781 has 8 divisors (see below), whose sum is σ = 1145886720. Its totient is φ = 845985168.

The previous prime is 994816733. The next prime is 994816787. The reversal of 994816781 is 187618499.

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

It is a de Polignac number, because none of the positive numbers 2^k-994816781 is a prime.

It is a super-2 number, since 2×994816781² = 1979320855518403922, 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 (994816787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558626 + ... + 560403.

It is an arithmetic number, because the mean of its divisors is an integer number (143235840).

Almost surely, 2^994816781 is an apocalyptic number.

It is an amenable number.

994816781 is a deficient number, since it is larger than the sum of its proper divisors (151069939).

994816781 is a wasteful number, since it uses less digits than its factorization.

994816781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119163.

The product of its digits is 870912, while the sum is 53.

The square root of 994816781 is about 31540.7162410748. The cubic root of 994816781 is about 998.2692666234.

The spelling of 994816781 in words is "nine hundred ninety-four million, eight hundred sixteen thousand, seven hundred eighty-one".