107521 has 4 divisors (see below), whose sum is σ = 113200. Its totient is φ = 101844.

The previous prime is 107509. The next prime is 107563. The reversal of 107521 is 125701.

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 an emirpimes, since its reverse is a distinct semiprime: 125701 = 337 ⋅373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-107521 is a prime.

It is a Duffinian number.

107521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 107495 and 107504.

It is not an unprimeable number, because it can be changed into a prime (107581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2811 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (28300).

It is a Proth number, since it is equal to 105 ⋅ 2¹⁰ + 1 and 105 < 2¹⁰.

2¹⁰⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

107521 is a deficient number, since it is larger than the sum of its proper divisors (5679).

107521 is an equidigital number, since it uses as much as digits as its factorization.

107521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5678.

The product of its (nonzero) digits is 70, while the sum is 16.

The square root of 107521 is about 327.9039493510. The cubic root of 107521 is about 47.5515230403.

The spelling of 107521 in words is "one hundred seven thousand, five hundred twenty-one".