1581681055 has 8 divisors (see below), whose sum is σ = 1901310192. Its totient is φ = 1263149568.

The previous prime is 1581681047. The next prime is 1581681107. The reversal of 1581681055 is 5501861851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1581681055 - 2³ = 1581681047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1581680999 and 1581681017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 271237 + ... + 277006.

It is an arithmetic number, because the mean of its divisors is an integer number (237663774).

Almost surely, 2^1581681055 is an apocalyptic number.

1581681055 is a deficient number, since it is larger than the sum of its proper divisors (319629137).

1581681055 is an equidigital number, since it uses as much as digits as its factorization.

1581681055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548825.

The product of its (nonzero) digits is 48000, while the sum is 40.

The square root of 1581681055 is about 39770.3539712686. The cubic root of 1581681055 is about 1165.1262071086.

The spelling of 1581681055 in words is "one billion, five hundred eighty-one million, six hundred eighty-one thousand, fifty-five".