121557755 has 8 divisors (see below), whose sum is σ = 159130224. Its totient is φ = 88405600.

The previous prime is 121557697. The next prime is 121557773. The reversal of 121557755 is 557755121.

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

It is not a de Polignac number, because 121557755 - 2¹⁰ = 121556731 is a prime.

It is an unprimeable number.

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, 1105016 + ... + 1105125.

It is an arithmetic number, because the mean of its divisors is an integer number (19891278).

Almost surely, 2^121557755 is an apocalyptic number.

121557755 is a deficient number, since it is larger than the sum of its proper divisors (37572469).

121557755 is a wasteful number, since it uses less digits than its factorization.

121557755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210157.

The product of its digits is 61250, while the sum is 38.

The square root of 121557755 is about 11025.3233512673. The cubic root of 121557755 is about 495.3675534245.

The spelling of 121557755 in words is "one hundred twenty-one million, five hundred fifty-seven thousand, seven hundred fifty-five".