117945281 has 4 divisors (see below), whose sum is σ = 118874112. Its totient is φ = 117016452.

The previous prime is 117945257. The next prime is 117945283. The reversal of 117945281 is 182549711.

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.

It is a cyclic number.

It is not a de Polignac number, because 117945281 - 2¹⁰ = 117944257 is a prime.

It is a super-2 number, since 2×117945281² = 27822178620337922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117945283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464225 + ... + 464478.

It is an arithmetic number, because the mean of its divisors is an integer number (29718528).

Almost surely, 2^117945281 is an apocalyptic number.

It is an amenable number.

117945281 is a deficient number, since it is larger than the sum of its proper divisors (928831).

117945281 is an equidigital number, since it uses as much as digits as its factorization.

117945281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928830.

The product of its digits is 20160, while the sum is 38.

The square root of 117945281 is about 10860.2615530198. The cubic root of 117945281 is about 490.4109851931.

The spelling of 117945281 in words is "one hundred seventeen million, nine hundred forty-five thousand, two hundred eighty-one".