102509123 has 4 divisors (see below), whose sum is σ = 107904360. Its totient is φ = 97113888.

The previous prime is 102509101. The next prime is 102509149. The reversal of 102509123 is 321905201.

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 102509123 - 2⁶ = 102509059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102509023) 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, 2697590 + ... + 2697627.

It is an arithmetic number, because the mean of its divisors is an integer number (26976090).

Almost surely, 2^102509123 is an apocalyptic number.

102509123 is a deficient number, since it is larger than the sum of its proper divisors (5395237).

102509123 is an equidigital number, since it uses as much as digits as its factorization.

102509123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5395236.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 102509123 is about 10124.6789084889. The cubic root of 102509123 is about 468.0089653602.

The spelling of 102509123 in words is "one hundred two million, five hundred nine thousand, one hundred twenty-three".