116909721 has 12 divisors (see below), whose sum is σ = 170004900. Its totient is φ = 77415840.

The previous prime is 116909669. The next prime is 116909729. The reversal of 116909721 is 127909611.

It can be written as a sum of positive squares in 2 ways, for example, as 58982400 + 57927321 = 7680^2 + 7611^2 .

It is not a de Polignac number, because 116909721 - 2⁶ = 116909657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (116909729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42250 + ... + 44931.

It is an arithmetic number, because the mean of its divisors is an integer number (14167075).

Almost surely, 2^116909721 is an apocalyptic number.

It is an amenable number.

116909721 is a deficient number, since it is larger than the sum of its proper divisors (53095179).

116909721 is a wasteful number, since it uses less digits than its factorization.

116909721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87336 (or 87333 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 36.

The square root of 116909721 is about 10812.4798728136. The cubic root of 116909721 is about 488.9714939409.

The spelling of 116909721 in words is "one hundred sixteen million, nine hundred nine thousand, seven hundred twenty-one".