1231117056 has 180 divisors, whose sum is σ = 3954216112. Its totient is φ = 378722304.

The previous prime is 1231117039. The next prime is 1231117061. The reversal of 1231117056 is 6507111321.

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 (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 267285 + ... + 271851.

Almost surely, 2^1231117056 is an apocalyptic number.

1231117056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1231117056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1977108056).

1231117056 is an abundant number, since it is smaller than the sum of its proper divisors (2723099056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1231117056 is an equidigital number, since it uses as much as digits as its factorization.

1231117056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608 (or 4585 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 1231117056 is about 35087.2776943439. The cubic root of 1231117056 is about 1071.7655238268.

Adding to 1231117056 its reverse (6507111321), we get a palindrome (7738228377).

The spelling of 1231117056 in words is "one billion, two hundred thirty-one million, one hundred seventeen thousand, fifty-six".