100105500000491 has 2 divisors, whose sum is σ = 100105500000492. Its totient is φ = 100105500000490.

The previous prime is 100105500000421. The next prime is 100105500000589. The reversal of 100105500000491 is 194000005501001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100105500000491 - 2²² = 100105495806187 is a prime.

It is a super-2 number, since 2×100105500000491² (a number of 29 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 100105500000491.

It is not a weakly prime, because it can be changed into another prime (100105500000421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50052750000245 + 50052750000246.

It is an arithmetic number, because the mean of its divisors is an integer number (50052750000246).

Almost surely, 2^{100105500000491} is an apocalyptic number.

100105500000491 is a deficient number, since it is larger than the sum of its proper divisors (1).

100105500000491 is an equidigital number, since it uses as much as digits as its factorization.

100105500000491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

Adding to 100105500000491 its reverse (194000005501001), we get a palindrome (294105505501492).

The spelling of 100105500000491 in words is "one hundred trillion, one hundred five billion, five hundred million, four hundred ninety-one", and thus it is an aban number.