978681115 has 4 divisors (see below), whose sum is σ = 1174417344. Its totient is φ = 782944888.

The previous prime is 978681107. The next prime is 978681139. The reversal of 978681115 is 511186879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511186879 = 7 ⋅73026697.

It is a cyclic number.

It is not a de Polignac number, because 978681115 - 2³ = 978681107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97868107 + ... + 97868116.

It is an arithmetic number, because the mean of its divisors is an integer number (293604336).

Almost surely, 2^978681115 is an apocalyptic number.

978681115 is a deficient number, since it is larger than the sum of its proper divisors (195736229).

978681115 is a wasteful number, since it uses less digits than its factorization.

978681115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195736228.

The product of its digits is 120960, while the sum is 46.

The square root of 978681115 is about 31283.8794748989. The cubic root of 978681115 is about 992.8425988292.

The spelling of 978681115 in words is "nine hundred seventy-eight million, six hundred eighty-one thousand, one hundred fifteen".