102005539 has 4 divisors (see below), whose sum is σ = 102272256. Its totient is φ = 101738824.

The previous prime is 102005537. The next prime is 102005573. The reversal of 102005539 is 935500201.

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 102005539 - 2¹ = 102005537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102005537) 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, 132784 + ... + 133549.

It is an arithmetic number, because the mean of its divisors is an integer number (25568064).

Almost surely, 2^102005539 is an apocalyptic number.

102005539 is a deficient number, since it is larger than the sum of its proper divisors (266717).

102005539 is an equidigital number, since it uses as much as digits as its factorization.

102005539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266716.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 102005539 is about 10099.7791560014. The cubic root of 102005539 is about 467.2413302082.

The spelling of 102005539 in words is "one hundred two million, five thousand, five hundred thirty-nine".