121331587 has 16 divisors (see below), whose sum is σ = 140908320. Its totient is φ = 103507200.

The previous prime is 121331531. The next prime is 121331627. The reversal of 121331587 is 785133121.

It is a cyclic number.

It is not a de Polignac number, because 121331587 - 2⁷ = 121331459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121331527) 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 15 ways as a sum of consecutive naturals, for example, 4137 + ... + 16117.

It is an arithmetic number, because the mean of its divisors is an integer number (8806770).

Almost surely, 2^121331587 is an apocalyptic number.

121331587 is a deficient number, since it is larger than the sum of its proper divisors (19576733).

121331587 is a wasteful number, since it uses less digits than its factorization.

121331587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12054.

The product of its digits is 5040, while the sum is 31.

The square root of 121331587 is about 11015.0618246109. The cubic root of 121331587 is about 495.0601389368.

The spelling of 121331587 in words is "one hundred twenty-one million, three hundred thirty-one thousand, five hundred eighty-seven".