100000991621519 has 2 divisors, whose sum is σ = 100000991621520. Its totient is φ = 100000991621518.

The previous prime is 100000991621507. The next prime is 100000991621533. The reversal of 100000991621519 is 915126199000001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000991621519 is a prime.

It is a super-2 number, since 2×100000991621519² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100000991621519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100000991621539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000495810759 + 50000495810760.

It is an arithmetic number, because the mean of its divisors is an integer number (50000495810760).

Almost surely, 2^{100000991621519} is an apocalyptic number.

100000991621519 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000991621519 is an equidigital number, since it uses as much as digits as its factorization.

100000991621519 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 44.

The spelling of 100000991621519 in words is "one hundred trillion, nine hundred ninety-one million, six hundred twenty-one thousand, five hundred nineteen".