121555193 has 4 divisors (see below), whose sum is σ = 121655808. Its totient is φ = 121454580.

The previous prime is 121555183. The next prime is 121555229. The reversal of 121555193 is 391555121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121555193 - 2²⁴ = 104777977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121555183) 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 3 ways as a sum of consecutive naturals, for example, 48473 + ... + 50918.

It is an arithmetic number, because the mean of its divisors is an integer number (30413952).

Almost surely, 2^121555193 is an apocalyptic number.

It is an amenable number.

121555193 is a deficient number, since it is larger than the sum of its proper divisors (100615).

121555193 is an equidigital number, since it uses as much as digits as its factorization.

121555193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100614.

The product of its digits is 6750, while the sum is 32.

The square root of 121555193 is about 11025.2071635865. The cubic root of 121555193 is about 495.3640732116.

The spelling of 121555193 in words is "one hundred twenty-one million, five hundred fifty-five thousand, one hundred ninety-three".