102249871 has 4 divisors (see below), whose sum is σ = 102277312.
Its totient is φ = 102222432.
The previous prime is 102249821. The next prime is 102249923. The reversal of 102249871 is 178942201.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 102249871 - 219 = 101725583 is a prime.
It is a super-2 number, since 2×1022498712 = 20910072239033282, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (102249821) 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 3 ways as a sum of consecutive naturals, for example, 7050 + ... + 15943.
It is an arithmetic number, because the mean of its divisors is an integer number (25569328).
Almost surely, 2102249871 is an apocalyptic number.
102249871 is a deficient number, since it is larger than the sum of its proper divisors (27441).
102249871 is an equidigital number, since it uses as much as digits as its factorization.
102249871 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 27440.
The product of its (nonzero) digits is 8064, while the sum is 34.
The square root of 102249871 is about 10111.8678294369.
The cubic root of 102249871 is about 467.6140909454.
The spelling of 102249871 in words is "one hundred two million, two hundred forty-nine thousand, eight hundred seventy-one".