121558749 has 32 divisors (see below), whose sum is σ = 188455680. Its totient is φ = 69070848.

The previous prime is 121558711. The next prime is 121558771. The reversal of 121558749 is 947855121.

It is not a de Polignac number, because 121558749 - 2⁹ = 121558237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121558749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121558049) 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 31 ways as a sum of consecutive naturals, for example, 23677 + ... + 28349.

It is an arithmetic number, because the mean of its divisors is an integer number (5889240).

Almost surely, 2^121558749 is an apocalyptic number.

It is an amenable number.

121558749 is a deficient number, since it is larger than the sum of its proper divisors (66896931).

121558749 is a wasteful number, since it uses less digits than its factorization.

121558749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4741.

The product of its digits is 100800, while the sum is 42.

The square root of 121558749 is about 11025.3684292181. The cubic root of 121558749 is about 495.3689036578.

The spelling of 121558749 in words is "one hundred twenty-one million, five hundred fifty-eight thousand, seven hundred forty-nine".