1231166115 has 16 divisors (see below), whose sum is σ = 2188740000. Its totient is φ = 656621856.

The previous prime is 1231166033. The next prime is 1231166173. The reversal of 1231166115 is 5116611321.

1231166115 is a `hidden beast` number, since 1 + 2 + 31 + 16 + 611 + 5 = 666.

It is not a de Polignac number, because 1231166115 - 2¹⁵ = 1231133347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4559740 + ... + 4560009.

It is an arithmetic number, because the mean of its divisors is an integer number (136796250).

Almost surely, 2^1231166115 is an apocalyptic number.

1231166115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1231166115 is a deficient number, since it is larger than the sum of its proper divisors (957573885).

1231166115 is an equidigital number, since it uses as much as digits as its factorization.

1231166115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119763 (or 9119757 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1231166115 is about 35087.9767869280. The cubic root of 1231166115 is about 1071.7797599620.

Adding to 1231166115 its reverse (5116611321), we get a palindrome (6347777436).

The spelling of 1231166115 in words is "one billion, two hundred thirty-one million, one hundred sixty-six thousand, one hundred fifteen".