102115889 has 4 divisors (see below), whose sum is σ = 108122724. Its totient is φ = 96109056.

The previous prime is 102115879. The next prime is 102115901. The reversal of 102115889 is 988511201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988511201 = 28439 ⋅34759.

It can be written as a sum of positive squares in 2 ways, for example, as 94090000 + 8025889 = 9700^2 + 2833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102115889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102115879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3003392 + ... + 3003425.

It is an arithmetic number, because the mean of its divisors is an integer number (27030681).

Almost surely, 2^102115889 is an apocalyptic number.

It is an amenable number.

102115889 is a deficient number, since it is larger than the sum of its proper divisors (6006835).

102115889 is an equidigital number, since it uses as much as digits as its factorization.

102115889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6006834.

The product of its (nonzero) digits is 5760, while the sum is 35.

The square root of 102115889 is about 10105.2406700682. The cubic root of 102115889 is about 467.4097573342.

The spelling of 102115889 in words is "one hundred two million, one hundred fifteen thousand, eight hundred eighty-nine".