978305673491 has 4 divisors (see below), whose sum is σ = 1029795445800. Its totient is φ = 926815901184.

The previous prime is 978305673479. The next prime is 978305673493. The reversal of 978305673491 is 194376503879.

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

It is a cyclic number.

It is not a de Polignac number, because 978305673491 - 2²⁶ = 978238564627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978305673493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25744886126 + ... + 25744886163.

It is an arithmetic number, because the mean of its divisors is an integer number (257448861450).

Almost surely, 2^978305673491 is an apocalyptic number.

978305673491 is a deficient number, since it is larger than the sum of its proper divisors (51489772309).

978305673491 is a wasteful number, since it uses less digits than its factorization.

978305673491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51489772308.

The product of its (nonzero) digits is 34292160, while the sum is 62.

The spelling of 978305673491 in words is "nine hundred seventy-eight billion, three hundred five million, six hundred seventy-three thousand, four hundred ninety-one".