1010199991 has 2 divisors, whose sum is σ = 1010199992. Its totient is φ = 1010199990.

The previous prime is 1010199979. The next prime is 1010200049. The reversal of 1010199991 is 1999910101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1010199991 - 2⁹ = 1010199479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010199691) 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, 505099995 + 505099996.

It is an arithmetic number, because the mean of its divisors is an integer number (505099996).

Almost surely, 2^1010199991 is an apocalyptic number.

1010199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010199991 is an equidigital number, since it uses as much as digits as its factorization.

1010199991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6561, while the sum is 40.

The square root of 1010199991 is about 31783.6434506807. The cubic root of 1010199991 is about 1003.3885020848.

The spelling of 1010199991 in words is "one billion, ten million, one hundred ninety-nine thousand, nine hundred ninety-one".