9121040978 has 16 divisors (see below), whose sum is σ = 15686033280. Its totient is φ = 3896526816.

The previous prime is 9121040969. The next prime is 9121040987. The reversal of 9121040978 is 8790401219.

It is an interprime number because it is at equal distance from previous prime (9121040969) and next prime (9121040987).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1036358 + ... + 1045121.

It is an arithmetic number, because the mean of its divisors is an integer number (980377080).

Almost surely, 2^9121040978 is an apocalyptic number.

9121040978 is a deficient number, since it is larger than the sum of its proper divisors (6564992302).

9121040978 is a wasteful number, since it uses less digits than its factorization.

9121040978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081801.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 9121040978 is about 95504.1411562870. The cubic root of 9121040978 is about 2089.3673426778.

The spelling of 9121040978 in words is "nine billion, one hundred twenty-one million, forty thousand, nine hundred seventy-eight".