101991813403 has 2 divisors, whose sum is σ = 101991813404. Its totient is φ = 101991813402.

The previous prime is 101991813331. The next prime is 101991813419. The reversal of 101991813403 is 304318199101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 101991813403 - 2²¹ = 101989716251 is a prime.

It is not a weakly prime, because it can be changed into another prime (101991813493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50995906701 + 50995906702.

It is an arithmetic number, because the mean of its divisors is an integer number (50995906702).

Almost surely, 2^101991813403 is an apocalyptic number.

101991813403 is a deficient number, since it is larger than the sum of its proper divisors (1).

101991813403 is an equidigital number, since it uses as much as digits as its factorization.

101991813403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 101991813403 in words is "one hundred one billion, nine hundred ninety-one million, eight hundred thirteen thousand, four hundred three".