117721237 has 8 divisors (see below), whose sum is σ = 123039000. Its totient is φ = 112487424.

The previous prime is 117721217. The next prime is 117721249. The reversal of 117721237 is 732127711.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 33246756 + 84474481 = 5766^2 + 9191^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117721237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 117721199 and 117721208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117721217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18112 + ... + 23737.

It is an arithmetic number, because the mean of its divisors is an integer number (15379875).

Almost surely, 2^117721237 is an apocalyptic number.

It is an amenable number.

117721237 is a deficient number, since it is larger than the sum of its proper divisors (5317763).

117721237 is an equidigital number, since it uses as much as digits as its factorization.

117721237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41975.

The product of its digits is 4116, while the sum is 31.

The square root of 117721237 is about 10849.9417970789. The cubic root of 117721237 is about 490.1002668616.

Adding to 117721237 its reverse (732127711), we get a palindrome (849848948).

The spelling of 117721237 in words is "one hundred seventeen million, seven hundred twenty-one thousand, two hundred thirty-seven".