121718359 has 4 divisors (see below), whose sum is σ = 139106704. Its totient is φ = 104330016.

The previous prime is 121718341. The next prime is 121718371. The reversal of 121718359 is 953817121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121718359 - 2⁵ = 121718327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121718329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8694162 + ... + 8694175.

It is an arithmetic number, because the mean of its divisors is an integer number (34776676).

Almost surely, 2^121718359 is an apocalyptic number.

121718359 is a deficient number, since it is larger than the sum of its proper divisors (17388345).

121718359 is an equidigital number, since it uses as much as digits as its factorization.

121718359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17388344.

The product of its digits is 15120, while the sum is 37.

The square root of 121718359 is about 11032.6043616183. The cubic root of 121718359 is about 495.5856198585.

The spelling of 121718359 in words is "one hundred twenty-one million, seven hundred eighteen thousand, three hundred fifty-nine".