1591172924849 has 2 divisors, whose sum is σ = 1591172924850. Its totient is φ = 1591172924848.

The previous prime is 1591172924777. The next prime is 1591172924857. The reversal of 1591172924849 is 9484292711951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 862186531600 + 728986393249 = 928540^2 + 853807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1591172924849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1591172924791 and 1591172924800.

It is not a weakly prime, because it can be changed into another prime (1591172924879) 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, 795586462424 + 795586462425.

It is an arithmetic number, because the mean of its divisors is an integer number (795586462425).

Almost surely, 2^{1591172924849} is an apocalyptic number.

It is an amenable number.

1591172924849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591172924849 is an equidigital number, since it uses as much as digits as its factorization.

1591172924849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 62.

The spelling of 1591172924849 in words is "one trillion, five hundred ninety-one billion, one hundred seventy-two million, nine hundred twenty-four thousand, eight hundred forty-nine".