117521 has 8 divisors (see below), whose sum is σ = 129024. Its totient is φ = 106560.

The previous prime is 117517. The next prime is 117529. The reversal of 117521 is 125711.

117521 = 75² + 76² + ... + 91².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 117521 - 2² = 117517 is a prime.

It is a super-2 number, since 2×117521² = 27622370882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 117521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416 + ... + 638.

It is an arithmetic number, because the mean of its divisors is an integer number (16128).

2¹¹⁷⁵²¹ is an apocalyptic number.

It is an amenable number.

117521 is a deficient number, since it is larger than the sum of its proper divisors (11503).

117521 is a wasteful number, since it uses less digits than its factorization.

117521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271.

The product of its digits is 70, while the sum is 17.

The square root of 117521 is about 342.8133602997. The cubic root of 117521 is about 48.9822231780.

The spelling of 117521 in words is "one hundred seventeen thousand, five hundred twenty-one".