117155021 has 2 divisors, whose sum is σ = 117155022. Its totient is φ = 117155020.

The previous prime is 117154997. The next prime is 117155023. The reversal of 117155021 is 120551711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71740900 + 45414121 = 8470^2 + 6739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117155021 is a prime.

Together with 117155023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117155023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58577510 + 58577511.

It is an arithmetic number, because the mean of its divisors is an integer number (58577511).

Almost surely, 2^117155021 is an apocalyptic number.

It is an amenable number.

117155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

117155021 is an equidigital number, since it uses as much as digits as its factorization.

117155021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 117155021 is about 10823.8173025971. The cubic root of 117155021 is about 489.3132417293.

The spelling of 117155021 in words is "one hundred seventeen million, one hundred fifty-five thousand, twenty-one".