117521217 has 48 divisors (see below), whose sum is σ = 193190400. Its totient is φ = 68198400.

The previous prime is 117521177. The next prime is 117521227. The reversal of 117521217 is 712125711.

117521217 is a `hidden beast` number, since 117 + 521 + 21 + 7 = 666.

It is not a de Polignac number, because 117521217 - 2¹¹ = 117519169 is a prime.

It is a super-2 number, since 2×117521217² = 27622472890322178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117521227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 457153 + ... + 457409.

It is an arithmetic number, because the mean of its divisors is an integer number (4024800).

Almost surely, 2^117521217 is an apocalyptic number.

It is an amenable number.

117521217 is a deficient number, since it is larger than the sum of its proper divisors (75669183).

117521217 is a wasteful number, since it uses less digits than its factorization.

117521217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 451 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 117521217 is about 10840.7203173959. The cubic root of 117521217 is about 489.8225332622.

Adding to 117521217 its reverse (712125711), we get a palindrome (829646928).

The spelling of 117521217 in words is "one hundred seventeen million, five hundred twenty-one thousand, two hundred seventeen".