1231583280 has 160 divisors (see below), whose sum is σ = 3904892928. Its totient is φ = 321024000.

The previous prime is 1231583237. The next prime is 1231583291. The reversal of 1231583280 is 823851321.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3071080 + ... + 3071480.

Almost surely, 2^1231583280 is an apocalyptic number.

1231583280 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 1231583280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1952446464).

1231583280 is an abundant number, since it is smaller than the sum of its proper divisors (2673309648).

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

1231583280 is a wasteful number, since it uses less digits than its factorization.

1231583280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 669 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1231583280 is about 35093.9208410802. The cubic root of 1231583280 is about 1071.9007992782.

The spelling of 1231583280 in words is "one billion, two hundred thirty-one million, five hundred eighty-three thousand, two hundred eighty".