1581011980 has 48 divisors (see below), whose sum is σ = 3362859360. Its totient is φ = 624319488.

The previous prime is 1581011977. The next prime is 1581011987. The reversal of 1581011980 is 891101851.

It is not an unprimeable number, because it can be changed into a prime (1581011987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 510276 + ... + 513364.

It is an arithmetic number, because the mean of its divisors is an integer number (70059570).

Almost surely, 2^1581011980 is an apocalyptic number.

1581011980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581011980 is an abundant number, since it is smaller than the sum of its proper divisors (1781847380).

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

1581011980 is a wasteful number, since it uses less digits than its factorization.

1581011980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3416 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 34.

The square root of 1581011980 is about 39761.9413509954. The cubic root of 1581011980 is about 1164.9618952705.

The spelling of 1581011980 in words is "one billion, five hundred eighty-one million, eleven thousand, nine hundred eighty".