1581534286681 has 4 divisors (see below), whose sum is σ = 1582381387792. Its totient is φ = 1580687185572.

The previous prime is 1581534286649. The next prime is 1581534286741. The reversal of 1581534286681 is 1866824351851.

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 not a de Polignac number, because 1581534286681 - 2⁵ = 1581534286649 is a prime.

It is a super-2 number, since 2×1581534286681² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1581534286181) 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, 423547755 + ... + 423551488.

It is an arithmetic number, because the mean of its divisors is an integer number (395595346948).

Almost surely, 2^{1581534286681} is an apocalyptic number.

It is an amenable number.

1581534286681 is a deficient number, since it is larger than the sum of its proper divisors (847101111).

1581534286681 is an equidigital number, since it uses as much as digits as its factorization.

1581534286681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847101110.

The product of its digits is 11059200, while the sum is 58.

The spelling of 1581534286681 in words is "one trillion, five hundred eighty-one billion, five hundred thirty-four million, two hundred eighty-six thousand, six hundred eighty-one".