103791991 has 2 divisors, whose sum is σ = 103791992. Its totient is φ = 103791990.

The previous prime is 103791983. The next prime is 103792009. The reversal of 103791991 is 199197301.

It is a weak prime.

It is an emirp because it is prime and its reverse (199197301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103791991 - 2³ = 103791983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103791971) 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, 51895995 + 51895996.

It is an arithmetic number, because the mean of its divisors is an integer number (51895996).

Almost surely, 2^103791991 is an apocalyptic number.

103791991 is a deficient number, since it is larger than the sum of its proper divisors (1).

103791991 is an equidigital number, since it uses as much as digits as its factorization.

103791991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 103791991 is about 10187.8354423302. The cubic root of 103791991 is about 469.9532034289.

The spelling of 103791991 in words is "one hundred three million, seven hundred ninety-one thousand, nine hundred ninety-one".