121917361 has 4 divisors (see below), whose sum is σ = 121989924. Its totient is φ = 121844800.

The previous prime is 121917359. The next prime is 121917371. The reversal of 121917361 is 163719121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 74926336 + 46991025 = 8656^2 + 6855^2 .

It is a cyclic number.

It is not a de Polignac number, because 121917361 - 2¹ = 121917359 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121917311) 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, 33700 + ... + 37141.

It is an arithmetic number, because the mean of its divisors is an integer number (30497481).

Almost surely, 2^121917361 is an apocalyptic number.

It is an amenable number.

121917361 is a deficient number, since it is larger than the sum of its proper divisors (72563).

121917361 is an equidigital number, since it uses as much as digits as its factorization.

121917361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72562.

The product of its digits is 2268, while the sum is 31.

The square root of 121917361 is about 11041.6194917231. The cubic root of 121917361 is about 495.8555567627.

The spelling of 121917361 in words is "one hundred twenty-one million, nine hundred seventeen thousand, three hundred sixty-one".