102799991 has 6 divisors (see below), whose sum is σ = 119583720. Its totient is φ = 88114236.

The previous prime is 102799967. The next prime is 102799993. The reversal of 102799991 is 199997201.

It is a happy number.

It is not a de Polignac number, because 102799991 - 2¹⁰ = 102798967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102799993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1048931 + ... + 1049028.

It is an arithmetic number, because the mean of its divisors is an integer number (19930620).

Almost surely, 2^102799991 is an apocalyptic number.

102799991 is a deficient number, since it is larger than the sum of its proper divisors (16783729).

102799991 is an equidigital number, since it uses as much as digits as its factorization.

102799991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097973 (or 2097966 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 47.

The square root of 102799991 is about 10139.0330406800. The cubic root of 102799991 is about 468.4512033317.

The spelling of 102799991 in words is "one hundred two million, seven hundred ninety-nine thousand, nine hundred ninety-one".