8954994781 has 4 divisors (see below), whose sum is σ = 8955253692. Its totient is φ = 8954735872.

The previous prime is 8954994779. The next prime is 8954994793. The reversal of 8954994781 is 1874994598.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2965782681 + 5989212100 = 54459^2 + 77390^2 .

It is a cyclic number.

It is not a de Polignac number, because 8954994781 - 2¹ = 8954994779 is a prime.

It is a super-2 number, since 2×8954994781² (a number of 21 digits) 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 (8954994761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67780 + ... + 150013.

It is an arithmetic number, because the mean of its divisors is an integer number (2238813423).

Almost surely, 2^8954994781 is an apocalyptic number.

It is an amenable number.

8954994781 is a deficient number, since it is larger than the sum of its proper divisors (258911).

8954994781 is a wasteful number, since it uses less digits than its factorization.

8954994781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258910.

The product of its digits is 26127360, while the sum is 64.

The square root of 8954994781 is about 94630.8341979505. The cubic root of 8954994781 is about 2076.6108191474.

The spelling of 8954994781 in words is "eight billion, nine hundred fifty-four million, nine hundred ninety-four thousand, seven hundred eighty-one".