102709 has 4 divisors (see below), whose sum is σ = 103360. Its totient is φ = 102060.

The previous prime is 102701. The next prime is 102761. The reversal of 102709 is 907201.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 907201 = 53 ⋅17117.

It is a cyclic number.

It is not a de Polignac number, because 102709 - 2³ = 102701 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102701) 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, 82 + ... + 460.

It is an arithmetic number, because the mean of its divisors is an integer number (25840).

2¹⁰²⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

102709 is a deficient number, since it is larger than the sum of its proper divisors (651).

102709 is an equidigital number, since it uses as much as digits as its factorization.

102709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 102709 is about 320.4824488174. The cubic root of 102709 is about 46.8312949669.

The spelling of 102709 in words is "one hundred two thousand, seven hundred nine".