9281778013394 has 4 divisors (see below), whose sum is σ = 13922667020094. Its totient is φ = 4640889006696.

The previous prime is 9281778013393. The next prime is 9281778013433. The reversal of 9281778013394 is 4933108771829.

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

It can be written as a sum of positive squares in only one way, i.e., 7527543987769 + 1754234025625 = 2743637^2 + 1324475^2 .

It is not an unprimeable number, because it can be changed into a prime (9281778013393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2320444503347 + ... + 2320444503350.

Almost surely, 2^{9281778013394} is an apocalyptic number.

9281778013394 is a deficient number, since it is larger than the sum of its proper divisors (4640889006700).

9281778013394 is a wasteful number, since it uses less digits than its factorization.

9281778013394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4640889006699.

The product of its (nonzero) digits is 18289152, while the sum is 62.

The spelling of 9281778013394 in words is "nine trillion, two hundred eighty-one billion, seven hundred seventy-eight million, thirteen thousand, three hundred ninety-four".