121718361 has 4 divisors (see below), whose sum is σ = 162291152. Its totient is φ = 81145572.

The previous prime is 121718341. The next prime is 121718371. The reversal of 121718361 is 163817121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121718361 - 2⁵ = 121718329 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121718341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20286391 + ... + 20286396.

It is an arithmetic number, because the mean of its divisors is an integer number (40572788).

Almost surely, 2^121718361 is an apocalyptic number.

It is an amenable number.

121718361 is a deficient number, since it is larger than the sum of its proper divisors (40572791).

121718361 is an equidigital number, since it uses as much as digits as its factorization.

121718361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40572790.

The product of its digits is 2016, while the sum is 30.

The square root of 121718361 is about 11032.6044522588. The cubic root of 121718361 is about 495.5856225729.

The spelling of 121718361 in words is "one hundred twenty-one million, seven hundred eighteen thousand, three hundred sixty-one".