117527281 has 9 divisors (see below), whose sum is σ = 121203201. Its totient is φ = 113960592.

The previous prime is 117527269. The next prime is 117527287. The reversal of 117527281 is 182725711.

The square root of 117527281 is 10841.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 83887281 + 33640000 = 9159^2 + 5800^2 .

It is a de Polignac number, because none of the positive numbers 2^k-117527281 is a prime.

It is a super-2 number, since 2×117527281² = 27625323558505922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117527287) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 400971 + ... + 401263.

Almost surely, 2^117527281 is an apocalyptic number.

117527281 is the 10841-st square number.

117527281 is the 5421-st centered octagonal number.

It is an amenable number.

117527281 is a deficient number, since it is larger than the sum of its proper divisors (3675920).

117527281 is an frugal number, since it uses more digits than its factorization.

117527281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 330 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The cubic root of 117527281 is about 489.8309579332.

The spelling of 117527281 in words is "one hundred seventeen million, five hundred twenty-seven thousand, two hundred eighty-one".