117721156 has 24 divisors (see below), whose sum is σ = 237779136. Its totient is φ = 49951200.

The previous prime is 117721129. The next prime is 117721157. The reversal of 117721156 is 651127711.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (117721157) 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, 17986 + ... + 23641.

It is an arithmetic number, because the mean of its divisors is an integer number (9907464).

Almost surely, 2^117721156 is an apocalyptic number.

It is an amenable number.

117721156 is an abundant number, since it is smaller than the sum of its proper divisors (120057980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117721156 is a wasteful number, since it uses less digits than its factorization.

117721156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41739 (or 41737 counting only the distinct ones).

The product of its digits is 2940, while the sum is 31.

The square root of 117721156 is about 10849.9380643394. The cubic root of 117721156 is about 490.1001544545.

Adding to 117721156 its reverse (651127711), we get a palindrome (768848867).

The spelling of 117721156 in words is "one hundred seventeen million, seven hundred twenty-one thousand, one hundred fifty-six".