121965478 has 4 divisors (see below), whose sum is σ = 182948220. Its totient is φ = 60982738.

The previous prime is 121965457. The next prime is 121965491. The reversal of 121965478 is 874569121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874569121 = 18731 ⋅46691.

It is a congruent number.

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, 30491368 + ... + 30491371.

It is an arithmetic number, because the mean of its divisors is an integer number (45737055).

Almost surely, 2^121965478 is an apocalyptic number.

121965478 is a deficient number, since it is larger than the sum of its proper divisors (60982742).

121965478 is an equidigital number, since it uses as much as digits as its factorization.

121965478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60982741.

The product of its digits is 120960, while the sum is 43.

The square root of 121965478 is about 11043.7981691083. The cubic root of 121965478 is about 495.9207811177.

The spelling of 121965478 in words is "one hundred twenty-one million, nine hundred sixty-five thousand, four hundred seventy-eight".