116638721 has 2 divisors, whose sum is σ = 116638722. Its totient is φ = 116638720.

The previous prime is 116638703. The next prime is 116638723. The reversal of 116638721 is 127836611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112890625 + 3748096 = 10625^2 + 1936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-116638721 is a prime.

Together with 116638723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (116638723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58319360 + 58319361.

It is an arithmetic number, because the mean of its divisors is an integer number (58319361).

Almost surely, 2^116638721 is an apocalyptic number.

It is an amenable number.

116638721 is a deficient number, since it is larger than the sum of its proper divisors (1).

116638721 is an equidigital number, since it uses as much as digits as its factorization.

116638721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 116638721 is about 10799.9407868747. The cubic root of 116638721 is about 488.5933851060.

The spelling of 116638721 in words is "one hundred sixteen million, six hundred thirty-eight thousand, seven hundred twenty-one".