121587551 has 8 divisors (see below), whose sum is σ = 122640864. Its totient is φ = 120538080.

The previous prime is 121587547. The next prime is 121587577. The reversal of 121587551 is 155785121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121587551 - 2² = 121587547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121587541) 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 in 7 ways as a sum of consecutive naturals, for example, 128741 + ... + 129681.

It is an arithmetic number, because the mean of its divisors is an integer number (15330108).

Almost surely, 2^121587551 is an apocalyptic number.

121587551 is a deficient number, since it is larger than the sum of its proper divisors (1053313).

121587551 is an equidigital number, since it uses as much as digits as its factorization.

121587551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1921.

The product of its digits is 14000, while the sum is 35.

The square root of 121587551 is about 11026.6745213596. The cubic root of 121587551 is about 495.4080246277.

The spelling of 121587551 in words is "one hundred twenty-one million, five hundred eighty-seven thousand, five hundred fifty-one".