109521 has 12 divisors (see below), whose sum is σ = 162448. Its totient is φ = 71064.
The previous prime is 109519. The next prime is 109537. The reversal of 109521 is 125901.
It is not a de Polignac number, because 109521 - 21 = 109519 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 109494 and 109503.
It is not an unprimeable number, because it can be changed into a prime (109541) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246 + ... + 528.
2109521 is an apocalyptic number.
It is an amenable number.
109521 is a deficient number, since it is larger than the sum of its proper divisors (52927).
109521 is a wasteful number, since it uses less digits than its factorization.
109521 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 332 (or 329 counting only the distinct ones).
The product of its (nonzero) digits is 90, while the sum is 18.
The square root of 109521 is about 330.9395715233. The cubic root of 109521 is about 47.8445491903.
It can be divided in two parts, 109 and 521, that added together give a triangular number (630 = T35).
The spelling of 109521 in words is "one hundred nine thousand, five hundred twenty-one".
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