1581108117 has 4 divisors (see below), whose sum is σ = 2108144160. Its totient is φ = 1054072076.

The previous prime is 1581108083. The next prime is 1581108127. The reversal of 1581108117 is 7118011851.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1581108117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581108127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263518017 + ... + 263518022.

It is an arithmetic number, because the mean of its divisors is an integer number (527036040).

Almost surely, 2^1581108117 is an apocalyptic number.

It is an amenable number.

1581108117 is a deficient number, since it is larger than the sum of its proper divisors (527036043).

1581108117 is an equidigital number, since it uses as much as digits as its factorization.

1581108117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527036042.

The product of its (nonzero) digits is 2240, while the sum is 33.

The square root of 1581108117 is about 39763.1502398892. The cubic root of 1581108117 is about 1164.9855075039.

Adding to 1581108117 its reverse (7118011851), we get a palindrome (8699119968).

The spelling of 1581108117 in words is "one billion, five hundred eighty-one million, one hundred eight thousand, one hundred seventeen".