978021831471 has 16 divisors (see below), whose sum is σ = 1307090318688. Its totient is φ = 650484454400.

The previous prime is 978021831443. The next prime is 978021831491. The reversal of 978021831471 is 174138120879.

It is a cyclic number.

It is not a de Polignac number, because 978021831471 - 2⁶ = 978021831407 is a prime.

It is a super-3 number, since 3×978021831471³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978021831491) 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 15 ways as a sum of consecutive naturals, for example, 8095591 + ... + 8215511.

It is an arithmetic number, because the mean of its divisors is an integer number (81693144918).

Almost surely, 2^978021831471 is an apocalyptic number.

978021831471 is a deficient number, since it is larger than the sum of its proper divisors (329068487217).

978021831471 is a wasteful number, since it uses less digits than its factorization.

978021831471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126282.

The product of its (nonzero) digits is 677376, while the sum is 51.

The spelling of 978021831471 in words is "nine hundred seventy-eight billion, twenty-one million, eight hundred thirty-one thousand, four hundred seventy-one".