117149281 has 4 divisors (see below), whose sum is σ = 122242752. Its totient is φ = 112055812.

The previous prime is 117149267. The next prime is 117149293. The reversal of 117149281 is 182941711.

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, and also an emirpimes, since its reverse is a distinct semiprime: 182941711 = 83 ⋅2204117.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117149281 is a prime.

It is a super-2 number, since 2×117149281² = 27447908077633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117149381) 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, 2546701 + ... + 2546746.

It is an arithmetic number, because the mean of its divisors is an integer number (30560688).

Almost surely, 2^117149281 is an apocalyptic number.

It is an amenable number.

117149281 is a deficient number, since it is larger than the sum of its proper divisors (5093471).

117149281 is an equidigital number, since it uses as much as digits as its factorization.

117149281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093470.

The product of its digits is 4032, while the sum is 34.

The square root of 117149281 is about 10823.5521433585. The cubic root of 117149281 is about 489.3052503123.

The spelling of 117149281 in words is "one hundred seventeen million, one hundred forty-nine thousand, two hundred eighty-one".