100445531521 has 2 divisors, whose sum is σ = 100445531522. Its totient is φ = 100445531520.

The previous prime is 100445531507. The next prime is 100445531531. The reversal of 100445531521 is 125135544001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94395803121 + 6049728400 = 307239^2 + 77780^2 .

It is a cyclic number.

It is not a de Polignac number, because 100445531521 - 2⁵ = 100445531489 is a prime.

It is not a weakly prime, because it can be changed into another prime (100445531531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50222765760 + 50222765761.

It is an arithmetic number, because the mean of its divisors is an integer number (50222765761).

Almost surely, 2^100445531521 is an apocalyptic number.

It is an amenable number.

100445531521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100445531521 is an equidigital number, since it uses as much as digits as its factorization.

100445531521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 31.

The spelling of 100445531521 in words is "one hundred billion, four hundred forty-five million, five hundred thirty-one thousand, five hundred twenty-one".