121361865 has 16 divisors (see below), whose sum is σ = 194799168. Its totient is φ = 64519616.

The previous prime is 121361837. The next prime is 121361893. The reversal of 121361865 is 568163121.

It is an interprime number because it is at equal distance from previous prime (121361837) and next prime (121361893).

It is a cyclic number.

It is not a de Polignac number, because 121361865 - 2¹¹ = 121359817 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 8007 + ... + 17516.

It is an arithmetic number, because the mean of its divisors is an integer number (12174948).

Almost surely, 2^121361865 is an apocalyptic number.

121361865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121361865 is a deficient number, since it is larger than the sum of its proper divisors (73437303).

121361865 is a wasteful number, since it uses less digits than its factorization.

121361865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25848.

The product of its digits is 8640, while the sum is 33.

The square root of 121361865 is about 11016.4361297109. The cubic root of 121361865 is about 495.1013158597.

The spelling of 121361865 in words is "one hundred twenty-one million, three hundred sixty-one thousand, eight hundred sixty-five".