978104891 has 4 divisors (see below), whose sum is σ = 994683000. Its totient is φ = 961526784.

The previous prime is 978104873. The next prime is 978104899. The reversal of 978104891 is 198401879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198401879 = 13 ⋅15261683.

It is a cyclic number.

It is not a de Polignac number, because 978104891 - 2²⁶ = 910996027 is a prime.

It is a super-3 number, since 3×978104891³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978104899) 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, 8288966 + ... + 8289083.

It is an arithmetic number, because the mean of its divisors is an integer number (248670750).

Almost surely, 2^978104891 is an apocalyptic number.

978104891 is a deficient number, since it is larger than the sum of its proper divisors (16578109).

978104891 is a wasteful number, since it uses less digits than its factorization.

978104891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16578108.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 978104891 is about 31274.6685194264. The cubic root of 978104891 is about 992.6477065941.

The spelling of 978104891 in words is "nine hundred seventy-eight million, one hundred four thousand, eight hundred ninety-one".