121878818 has 4 divisors (see below), whose sum is σ = 182818230. Its totient is φ = 60939408.

The previous prime is 121878781. The next prime is 121878833. The reversal of 121878818 is 818878121.

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

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 284089 = 11027^2 + 533^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 30469703 + ... + 30469706.

Almost surely, 2^121878818 is an apocalyptic number.

121878818 is a deficient number, since it is larger than the sum of its proper divisors (60939412).

121878818 is an equidigital number, since it uses as much as digits as its factorization.

121878818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60939411.

The product of its digits is 57344, while the sum is 44.

The square root of 121878818 is about 11039.8740029042. The cubic root of 121878818 is about 495.8032979350.

The spelling of 121878818 in words is "one hundred twenty-one million, eight hundred seventy-eight thousand, eight hundred eighteen".