101203101991 has 2 divisors, whose sum is σ = 101203101992. Its totient is φ = 101203101990.

The previous prime is 101203101977. The next prime is 101203102019. The reversal of 101203101991 is 199101302101.

It is an a-pointer prime, because the next prime (101203102019) can be obtained adding 101203101991 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101203101991 - 2¹⁷ = 101202970919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101203102991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50601550995 + 50601550996.

It is an arithmetic number, because the mean of its divisors is an integer number (50601550996).

Almost surely, 2^101203101991 is an apocalyptic number.

101203101991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101203101991 is an equidigital number, since it uses as much as digits as its factorization.

101203101991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 28.

The spelling of 101203101991 in words is "one hundred one billion, two hundred three million, one hundred one thousand, nine hundred ninety-one".