5891581561 has 2 divisors, whose sum is σ = 5891581562. Its totient is φ = 5891581560.

The previous prime is 5891581559. The next prime is 5891581573. The reversal of 5891581561 is 1651851985.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4131275625 + 1760305936 = 64275^2 + 41956^2 .

It is a cyclic number.

It is not a de Polignac number, because 5891581561 - 2¹ = 5891581559 is a prime.

Together with 5891581559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5891581511) 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 as a sum of consecutive naturals, namely, 2945790780 + 2945790781.

It is an arithmetic number, because the mean of its divisors is an integer number (2945790781).

Almost surely, 2^5891581561 is an apocalyptic number.

It is an amenable number.

5891581561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5891581561 is an equidigital number, since it uses as much as digits as its factorization.

5891581561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 49.

The square root of 5891581561 is about 76756.6385467733. The cubic root of 5891581561 is about 1806.1090332774.

The spelling of 5891581561 in words is "five billion, eight hundred ninety-one million, five hundred eighty-one thousand, five hundred sixty-one".