1581341540 has 24 divisors (see below), whose sum is σ = 3465201600. Its totient is φ = 605034848.

The previous prime is 1581341539. The next prime is 1581341591. The reversal of 1581341540 is 451431851.

It is a super-2 number, since 2×1581341540² = 5001282132259143200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1581341497 and 1581341506.

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, 1718390 + ... + 1719309.

It is an arithmetic number, because the mean of its divisors is an integer number (144383400).

Almost surely, 2^1581341540 is an apocalyptic number.

1581341540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581341540 is an abundant number, since it is smaller than the sum of its proper divisors (1883860060).

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

1581341540 is a wasteful number, since it uses less digits than its factorization.

1581341540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437731 (or 3437729 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 1581341540 is about 39766.0852989077. The cubic root of 1581341540 is about 1165.0428346043.

The spelling of 1581341540 in words is "one billion, five hundred eighty-one million, three hundred forty-one thousand, five hundred forty".