100971639521 has 2 divisors, whose sum is σ = 100971639522. Its totient is φ = 100971639520.

The previous prime is 100971639499. The next prime is 100971639533. The reversal of 100971639521 is 125936179001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100940279521 + 31360000 = 317711^2 + 5600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100971639521 is a prime.

It is not a weakly prime, because it can be changed into another prime (100971639551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50485819760 + 50485819761.

It is an arithmetic number, because the mean of its divisors is an integer number (50485819761).

Almost surely, 2^100971639521 is an apocalyptic number.

It is an amenable number.

100971639521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100971639521 is an equidigital number, since it uses as much as digits as its factorization.

100971639521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 44.

The spelling of 100971639521 in words is "one hundred billion, nine hundred seventy-one million, six hundred thirty-nine thousand, five hundred twenty-one".