121653879 has 8 divisors (see below), whose sum is σ = 163641072. Its totient is φ = 80384640.

The previous prime is 121653871. The next prime is 121653899. The reversal of 121653879 is 978356121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121653879 - 2³ = 121653871 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121653879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121653871) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 179092 + ... + 179769.

It is an arithmetic number, because the mean of its divisors is an integer number (20455134).

Almost surely, 2^121653879 is an apocalyptic number.

121653879 is a deficient number, since it is larger than the sum of its proper divisors (41987193).

121653879 is a wasteful number, since it uses less digits than its factorization.

121653879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358977.

The product of its digits is 90720, while the sum is 42.

The square root of 121653879 is about 11029.6817270491. The cubic root of 121653879 is about 495.4980926483.

The spelling of 121653879 in words is "one hundred twenty-one million, six hundred fifty-three thousand, eight hundred seventy-nine".