923978081 has 8 divisors (see below), whose sum is σ = 995337000. Its totient is φ = 852659712.

The previous prime is 923978053. The next prime is 923978089. The reversal of 923978081 is 180879329.

It can be written as a sum of positive squares in 4 ways, for example, as 215619856 + 708358225 = 14684^2 + 26615^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-923978081 is a prime.

It is a super-2 number, since 2×923978081² = 1707470988336885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (923978089) 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, 50795 + ... + 66543.

It is an arithmetic number, because the mean of its divisors is an integer number (124417125).

Almost surely, 2^923978081 is an apocalyptic number.

It is an amenable number.

923978081 is a deficient number, since it is larger than the sum of its proper divisors (71358919).

923978081 is a wasteful number, since it uses less digits than its factorization.

923978081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20275.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 923978081 is about 30397.0077639231. The cubic root of 923978081 is about 973.9886356082.

The spelling of 923978081 in words is "nine hundred twenty-three million, nine hundred seventy-eight thousand, eighty-one".