121905577 has 8 divisors (see below), whose sum is σ = 128563200. Its totient is φ = 115272144.

The previous prime is 121905557. The next prime is 121905601. The reversal of 121905577 is 775509121.

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 121905577 - 2¹⁵ = 121872809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121905517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4824 + ... + 16342.

It is an arithmetic number, because the mean of its divisors is an integer number (16070400).

Almost surely, 2^121905577 is an apocalyptic number.

It is an amenable number.

121905577 is a deficient number, since it is larger than the sum of its proper divisors (6657623).

121905577 is a wasteful number, since it uses less digits than its factorization.

121905577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12095.

The product of its (nonzero) digits is 22050, while the sum is 37.

The square root of 121905577 is about 11041.0858614540. The cubic root of 121905577 is about 495.8395805033.

It can be divided in two parts, 12190 and 5577, that multiplied together give a triangular number (67983630 = T₁₁₆₆₀).

The spelling of 121905577 in words is "one hundred twenty-one million, nine hundred five thousand, five hundred seventy-seven".