121878351 has 48 divisors (see below), whose sum is σ = 210572544. Its totient is φ = 69004224.

The previous prime is 121878349. The next prime is 121878353. The reversal of 121878351 is 153878121.

It is an interprime number because it is at equal distance from previous prime (121878349) and next prime (121878353).

It is not a de Polignac number, because 121878351 - 2¹ = 121878349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121878353) 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 in 47 ways as a sum of consecutive naturals, for example, 232776 + ... + 233298.

It is an arithmetic number, because the mean of its divisors is an integer number (4386928).

Almost surely, 2^121878351 is an apocalyptic number.

121878351 is a deficient number, since it is larger than the sum of its proper divisors (88694193).

121878351 is an equidigital number, since it uses as much as digits as its factorization.

121878351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 670 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 121878351 is about 11039.8528522802. The cubic root of 121878351 is about 495.8026646819.

The spelling of 121878351 in words is "one hundred twenty-one million, eight hundred seventy-eight thousand, three hundred fifty-one".