101001105991 has 2 divisors, whose sum is σ = 101001105992. Its totient is φ = 101001105990.

The previous prime is 101001105941. The next prime is 101001106007. The reversal of 101001105991 is 199501100101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101001105991 - 2³⁵ = 66641367623 is a prime.

It is a super-2 number, since 2×101001105991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101001105911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50500552995 + 50500552996.

It is an arithmetic number, because the mean of its divisors is an integer number (50500552996).

Almost surely, 2^101001105991 is an apocalyptic number.

101001105991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101001105991 is an equidigital number, since it uses as much as digits as its factorization.

101001105991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405, while the sum is 28.

The spelling of 101001105991 in words is "one hundred one billion, one million, one hundred five thousand, nine hundred ninety-one".