8725109 has 4 divisors (see below), whose sum is σ = 8733516. Its totient is φ = 8716704.

The previous prime is 8725103. The next prime is 8725111. The reversal of 8725109 is 9015278.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9015278 = 2 ⋅4507639.

It can be written as a sum of positive squares in 2 ways, for example, as 442225 + 8282884 = 665^2 + 2878^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8725109 is a prime.

It is a super-2 number, since 2×8725109² = 152255054123762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725103) 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, 2384 + ... + 4809.

It is an arithmetic number, because the mean of its divisors is an integer number (2183379).

Almost surely, 2^8725109 is an apocalyptic number.

It is an amenable number.

8725109 is a deficient number, since it is larger than the sum of its proper divisors (8407).

8725109 is a wasteful number, since it uses less digits than its factorization.

8725109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 8725109 is about 2953.8295482306. The cubic root of 8725109 is about 205.8686833934.

The spelling of 8725109 in words is "eight million, seven hundred twenty-five thousand, one hundred nine".