121554387 has 12 divisors (see below), whose sum is σ = 178892064. Its totient is φ = 79506960.

The previous prime is 121554383. The next prime is 121554397. The reversal of 121554387 is 783455121.

121554387 is a `hidden beast` number, since 1 + 21 + 554 + 3 + 87 = 666.

It is not a de Polignac number, because 121554387 - 2² = 121554383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121554383) 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, 126939 + ... + 127892.

It is an arithmetic number, because the mean of its divisors is an integer number (14907672).

Almost surely, 2^121554387 is an apocalyptic number.

121554387 is a deficient number, since it is larger than the sum of its proper divisors (57337677).

121554387 is a wasteful number, since it uses less digits than its factorization.

121554387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254890 (or 254887 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 121554387 is about 11025.1706109248. The cubic root of 121554387 is about 495.3629783336.

The spelling of 121554387 in words is "one hundred twenty-one million, five hundred fifty-four thousand, three hundred eighty-seven".