102155609 has 8 divisors (see below), whose sum is σ = 109356000. Its totient is φ = 95137632.

The previous prime is 102155587. The next prime is 102155617. The reversal of 102155609 is 906551201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102155609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102155629) 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 7 ways as a sum of consecutive naturals, for example, 44444 + ... + 46685.

It is an arithmetic number, because the mean of its divisors is an integer number (13669500).

Almost surely, 2^102155609 is an apocalyptic number.

102155609 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

102155609 is a deficient number, since it is larger than the sum of its proper divisors (7200391).

102155609 is an equidigital number, since it uses as much as digits as its factorization.

102155609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91207.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 102155609 is about 10107.2057958666. The cubic root of 102155609 is about 467.4703522430.

The spelling of 102155609 in words is "one hundred two million, one hundred fifty-five thousand, six hundred nine".