102017491991 has 2 divisors, whose sum is σ = 102017491992. Its totient is φ = 102017491990.

The previous prime is 102017491931. The next prime is 102017491993. The reversal of 102017491991 is 199194710201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102017491991 - 2¹⁴ = 102017475607 is a prime.

Together with 102017491993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102017491993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51008745995 + 51008745996.

It is an arithmetic number, because the mean of its divisors is an integer number (51008745996).

Almost surely, 2^102017491991 is an apocalyptic number.

102017491991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102017491991 is an equidigital number, since it uses as much as digits as its factorization.

102017491991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 102017491991 in words is "one hundred two billion, seventeen million, four hundred ninety-one thousand, nine hundred ninety-one".