117520281 has 24 divisors (see below), whose sum is σ = 176974560. Its totient is φ = 77064912.

The previous prime is 117520243. The next prime is 117520283. The reversal of 117520281 is 182025711.

117520281 is a `hidden beast` number, since 117 + 520 + 28 + 1 = 666.

It is not a de Polignac number, because 117520281 - 2¹⁸ = 117258137 is a prime.

It is a super-2 number, since 2×117520281² = 27622032892637922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (117520283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 513075 + ... + 513303.

It is an arithmetic number, because the mean of its divisors is an integer number (7373940).

Almost surely, 2^117520281 is an apocalyptic number.

It is an amenable number.

117520281 is a deficient number, since it is larger than the sum of its proper divisors (59454279).

117520281 is an frugal number, since it uses more digits than its factorization.

117520281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 117520281 is about 10840.6771467469. The cubic root of 117520281 is about 489.8212328584.

Adding to 117520281 its reverse (182025711), we get a palindrome (299545992).

The spelling of 117520281 in words is "one hundred seventeen million, five hundred twenty thousand, two hundred eighty-one".