1971589235513 has 2 divisors, whose sum is σ = 1971589235514. Its totient is φ = 1971589235512.

The previous prime is 1971589235509. The next prime is 1971589235521. The reversal of 1971589235513 is 3155329851791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1398951969529 + 572637265984 = 1182773^2 + 756728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1971589235513 - 2² = 1971589235509 is a prime.

It is a super-2 number, since 2×1971589235513² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1971589205513) 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, 985794617756 + 985794617757.

It is an arithmetic number, because the mean of its divisors is an integer number (985794617757).

Almost surely, 2^{1971589235513} is an apocalyptic number.

It is an amenable number.

1971589235513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1971589235513 is an equidigital number, since it uses as much as digits as its factorization.

1971589235513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206000, while the sum is 59.

The spelling of 1971589235513 in words is "one trillion, nine hundred seventy-one billion, five hundred eighty-nine million, two hundred thirty-five thousand, five hundred thirteen".