1231112978 has 16 divisors (see below), whose sum is σ = 1866170880. Its totient is φ = 609089856.

The previous prime is 1231112977. The next prime is 1231113061. The reversal of 1231112978 is 8792111321.

It is not an unprimeable number, because it can be changed into a prime (1231112977) 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, 66218 + ... + 82746.

It is an arithmetic number, because the mean of its divisors is an integer number (116635680).

Almost surely, 2^1231112978 is an apocalyptic number.

1231112978 is a deficient number, since it is larger than the sum of its proper divisors (635057902).

1231112978 is a wasteful number, since it uses less digits than its factorization.

1231112978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16921.

The product of its digits is 6048, while the sum is 35.

The square root of 1231112978 is about 35087.2195820644. The cubic root of 1231112978 is about 1071.7643404396.

The spelling of 1231112978 in words is "one billion, two hundred thirty-one million, one hundred twelve thousand, nine hundred seventy-eight".