1231091680 has 288 divisors, whose sum is σ = 3735559296. Its totient is φ = 379846656.

The previous prime is 1231091663. The next prime is 1231091717. The reversal of 1231091680 is 861901321.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4790112 + ... + 4790368.

It is an arithmetic number, because the mean of its divisors is an integer number (12970692).

Almost surely, 2^1231091680 is an apocalyptic number.

1231091680 is a gapful number since it is divisible by the number (10) 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 1231091680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1867779648).

1231091680 is an abundant number, since it is smaller than the sum of its proper divisors (2504467616).

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

1231091680 is a wasteful number, since it uses less digits than its factorization.

1231091680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1231091680 is about 35086.9160799293. The cubic root of 1231091680 is about 1071.7581599701.

The spelling of 1231091680 in words is "one billion, two hundred thirty-one million, ninety-one thousand, six hundred eighty".