1591124891 has 2 divisors, whose sum is σ = 1591124892. Its totient is φ = 1591124890.

The previous prime is 1591124881. The next prime is 1591124897. The reversal of 1591124891 is 1984211951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1591124891 - 2¹⁰ = 1591123867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1591124897) 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, 795562445 + 795562446.

It is an arithmetic number, because the mean of its divisors is an integer number (795562446).

Almost surely, 2^1591124891 is an apocalyptic number.

1591124891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591124891 is an equidigital number, since it uses as much as digits as its factorization.

1591124891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 41.

The square root of 1591124891 is about 39888.9068664460. The cubic root of 1591124891 is about 1167.4405030000.

The spelling of 1591124891 in words is "one billion, five hundred ninety-one million, one hundred twenty-four thousand, eight hundred ninety-one".