1581151360 has 64 divisors (see below), whose sum is σ = 3788280000. Its totient is φ = 631065600.

The previous prime is 1581151357. The next prime is 1581151379. The reversal of 1581151360 is 631511851.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316885 + ... + 321835.

It is an arithmetic number, because the mean of its divisors is an integer number (59191875).

Almost surely, 2^1581151360 is an apocalyptic number.

1581151360 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 1581151360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1894140000).

1581151360 is an abundant number, since it is smaller than the sum of its proper divisors (2207128640).

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

1581151360 is an equidigital number, since it uses as much as digits as its factorization.

1581151360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469 (or 5457 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 1581151360 is about 39763.6939933905. The cubic root of 1581151360 is about 1164.9961281162.

The spelling of 1581151360 in words is "one billion, five hundred eighty-one million, one hundred fifty-one thousand, three hundred sixty".