121542587 has 2 divisors, whose sum is σ = 121542588. Its totient is φ = 121542586.

The previous prime is 121542581. The next prime is 121542613. The reversal of 121542587 is 785245121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121542587 - 2⁶ = 121542523 is a prime.

It is not a weakly prime, because it can be changed into another prime (121542581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60771293 + 60771294.

It is an arithmetic number, because the mean of its divisors is an integer number (60771294).

Almost surely, 2^121542587 is an apocalyptic number.

121542587 is a deficient number, since it is larger than the sum of its proper divisors (1).

121542587 is an equidigital number, since it uses as much as digits as its factorization.

121542587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 35.

The square root of 121542587 is about 11024.6354588258. The cubic root of 121542587 is about 495.3469485480.

It can be divided in two parts, 12154 and 2587, that added together give a palindrome (14741).

The spelling of 121542587 in words is "one hundred twenty-one million, five hundred forty-two thousand, five hundred eighty-seven".