117821237 has 4 divisors (see below), whose sum is σ = 124751916. Its totient is φ = 110890560.

The previous prime is 117821227. The next prime is 117821251. The reversal of 117821237 is 732128711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 732128711 = 127 ⋅5764793.

It can be written as a sum of positive squares in 2 ways, for example, as 53597041 + 64224196 = 7321^2 + 8014^2 .

It is a cyclic number.

It is not a de Polignac number, because 117821237 - 2²⁰ = 116772661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117821227) 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, 3465314 + ... + 3465347.

It is an arithmetic number, because the mean of its divisors is an integer number (31187979).

Almost surely, 2^117821237 is an apocalyptic number.

117821237 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

117821237 is a deficient number, since it is larger than the sum of its proper divisors (6930679).

117821237 is an equidigital number, since it uses as much as digits as its factorization.

117821237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930678.

The product of its digits is 4704, while the sum is 32.

The square root of 117821237 is about 10854.5491384949. The cubic root of 117821237 is about 490.2390018287.

Adding to 117821237 its reverse (732128711), we get a palindrome (849949948).

The spelling of 117821237 in words is "one hundred seventeen million, eight hundred twenty-one thousand, two hundred thirty-seven".