102617989 has 4 divisors (see below), whose sum is σ = 102946156. Its totient is φ = 102289824.

The previous prime is 102617987. The next prime is 102618013. The reversal of 102617989 is 989716201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 708964 + 101909025 = 842^2 + 10095^2 .

It is a cyclic number.

It is not a de Polignac number, because 102617989 - 2¹ = 102617987 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 (102617981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163614 + ... + 164239.

It is an arithmetic number, because the mean of its divisors is an integer number (25736539).

Almost surely, 2^102617989 is an apocalyptic number.

It is an amenable number.

102617989 is a deficient number, since it is larger than the sum of its proper divisors (328167).

102617989 is an equidigital number, since it uses as much as digits as its factorization.

102617989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328166.

The product of its (nonzero) digits is 54432, while the sum is 43.

The square root of 102617989 is about 10130.0537510914. The cubic root of 102617989 is about 468.1745839138.

The spelling of 102617989 in words is "one hundred two million, six hundred seventeen thousand, nine hundred eighty-nine".