978912831 has 8 divisors (see below), whose sum is σ = 1405618480. Its totient is φ = 602407872.

The previous prime is 978912829. The next prime is 978912833. The reversal of 978912831 is 138219879.

It is an interprime number because it is at equal distance from previous prime (978912829) and next prime (978912833).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 978912831 - 2¹ = 978912829 is a prime.

It is a super-2 number, since 2×978912831² = 1916540661392869122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978912833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12550126 + ... + 12550203.

It is an arithmetic number, because the mean of its divisors is an integer number (175702310).

Almost surely, 2^978912831 is an apocalyptic number.

978912831 is a deficient number, since it is larger than the sum of its proper divisors (426705649).

978912831 is a wasteful number, since it uses less digits than its factorization.

978912831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25100345.

The product of its digits is 217728, while the sum is 48.

The square root of 978912831 is about 31287.5826966546. The cubic root of 978912831 is about 992.9209489537.

The spelling of 978912831 in words is "nine hundred seventy-eight million, nine hundred twelve thousand, eight hundred thirty-one".