117521871 has 4 divisors (see below), whose sum is σ = 156695832. Its totient is φ = 78347912.

The previous prime is 117521861. The next prime is 117521893. The reversal of 117521871 is 178125711.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 117521871 - 2¹⁹ = 116997583 is a prime.

It is a super-2 number, since 2×117521871² = 27622780326681282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117521801) 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, 19586976 + ... + 19586981.

It is an arithmetic number, because the mean of its divisors is an integer number (39173958).

Almost surely, 2^117521871 is an apocalyptic number.

117521871 is a deficient number, since it is larger than the sum of its proper divisors (39173961).

117521871 is an equidigital number, since it uses as much as digits as its factorization.

117521871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39173960.

The product of its digits is 3920, while the sum is 33.

The square root of 117521871 is about 10840.7504814012. The cubic root of 117521871 is about 489.8234418736.

The spelling of 117521871 in words is "one hundred seventeen million, five hundred twenty-one thousand, eight hundred seventy-one".