100100109491 has 2 divisors, whose sum is σ = 100100109492. Its totient is φ = 100100109490.

The previous prime is 100100109457. The next prime is 100100109541. The reversal of 100100109491 is 194901001001.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100100109491 is a prime.

It is a super-2 number, since 2×100100109491² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 100100109491.

It is not a weakly prime, because it can be changed into another prime (100100009491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050054745 + 50050054746.

It is an arithmetic number, because the mean of its divisors is an integer number (50050054746).

Almost surely, 2^100100109491 is an apocalyptic number.

100100109491 is a deficient number, since it is larger than the sum of its proper divisors (1).

100100109491 is an equidigital number, since it uses as much as digits as its factorization.

100100109491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 26.

The spelling of 100100109491 in words is "one hundred billion, one hundred million, one hundred nine thousand, four hundred ninety-one".