117549971 has 18 divisors (see below), whose sum is σ = 149492988. Its totient is φ = 91401240.

The previous prime is 117549947. The next prime is 117550039. The reversal of 117549971 is 179945711.

It is not a de Polignac number, because 117549971 - 2¹⁰ = 117548947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117549571) 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 17 ways as a sum of consecutive naturals, for example, 251480 + ... + 251946.

It is an arithmetic number, because the mean of its divisors is an integer number (8305166).

Almost surely, 2^117549971 is an apocalyptic number.

117549971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

117549971 is a deficient number, since it is larger than the sum of its proper divisors (31943017).

117549971 is an frugal number, since it uses more digits than its factorization.

117549971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 485 counting only the distinct ones).

The product of its digits is 79380, while the sum is 44.

The square root of 117549971 is about 10842.0464396718. The cubic root of 117549971 is about 489.8624784141.

Multiplying 117549971 by its sum of digits (44), we get a square (5172198724 = 71918²).

The spelling of 117549971 in words is "one hundred seventeen million, five hundred forty-nine thousand, nine hundred seventy-one".