121555413 has 12 divisors (see below), whose sum is σ = 200663008. Its totient is φ = 69460200.

The previous prime is 121555411. The next prime is 121555429. The reversal of 121555413 is 314555121.

It is not a de Polignac number, because 121555413 - 2¹ = 121555411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121555411) 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 11 ways as a sum of consecutive naturals, for example, 964663 + ... + 964788.

Almost surely, 2^121555413 is an apocalyptic number.

It is an amenable number.

121555413 is a deficient number, since it is larger than the sum of its proper divisors (79107595).

121555413 is a wasteful number, since it uses less digits than its factorization.

121555413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929464 (or 1929461 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 121555413 is about 11025.2171407188. The cubic root of 121555413 is about 495.3643720609.

The spelling of 121555413 in words is "one hundred twenty-one million, five hundred fifty-five thousand, four hundred thirteen".