100091819 has 2 divisors, whose sum is σ = 100091820. Its totient is φ = 100091818.

The previous prime is 100091813. The next prime is 100091843. The reversal of 100091819 is 918190001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100091819 - 2¹² = 100087723 is a prime.

It is a super-2 number, since 2×100091819² = 20036744461457522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100091791 and 100091800.

It is not a weakly prime, because it can be changed into another prime (100091813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50045909 + 50045910.

It is an arithmetic number, because the mean of its divisors is an integer number (50045910).

Almost surely, 2^100091819 is an apocalyptic number.

100091819 is a deficient number, since it is larger than the sum of its proper divisors (1).

100091819 is an equidigital number, since it uses as much as digits as its factorization.

100091819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 100091819 is about 10004.5898966424. The cubic root of 100091819 is about 464.3009019185.

The spelling of 100091819 in words is "one hundred million, ninety-one thousand, eight hundred nineteen".