1000010109991 has 2 divisors, whose sum is σ = 1000010109992. Its totient is φ = 1000010109990.

The previous prime is 1000010109949. The next prime is 1000010110039. The reversal of 1000010109991 is 1999010100001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1000010109991 - 2¹⁵ = 1000010077223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000010109911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500005054995 + 500005054996.

It is an arithmetic number, because the mean of its divisors is an integer number (500005054996).

Almost surely, 2^{1000010109991} is an apocalyptic number.

1000010109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000010109991 is an equidigital number, since it uses as much as digits as its factorization.

1000010109991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 31.

Adding to 1000010109991 its reverse (1999010100001), we get a palindrome (2999020209992).

The spelling of 1000010109991 in words is "one trillion, ten million, one hundred nine thousand, nine hundred ninety-one".