102855509 has 4 divisors (see below), whose sum is σ = 104094816. Its totient is φ = 101616204.

The previous prime is 102855497. The next prime is 102855539. The reversal of 102855509 is 905558201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102855509 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 (102855539) 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, 619529 + ... + 619694.

It is an arithmetic number, because the mean of its divisors is an integer number (26023704).

Almost surely, 2^102855509 is an apocalyptic number.

It is an amenable number.

102855509 is a deficient number, since it is larger than the sum of its proper divisors (1239307).

102855509 is an equidigital number, since it uses as much as digits as its factorization.

102855509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239306.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 102855509 is about 10141.7705061789. The cubic root of 102855509 is about 468.5355184930.

The spelling of 102855509 in words is "one hundred two million, eight hundred fifty-five thousand, five hundred nine".