121552755 has 16 divisors (see below), whose sum is σ = 194969760. Its totient is φ = 64666368.

The previous prime is 121552727. The next prime is 121552757. The reversal of 121552755 is 557255121.

It is not a de Polignac number, because 121552755 - 2⁹ = 121552243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121552757) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3772 + ... + 16041.

It is an arithmetic number, because the mean of its divisors is an integer number (12185610).

Almost surely, 2^121552755 is an apocalyptic number.

121552755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121552755 is a deficient number, since it is larger than the sum of its proper divisors (73417005).

121552755 is a wasteful number, since it uses less digits than its factorization.

121552755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20230.

The product of its digits is 17500, while the sum is 33.

The square root of 121552755 is about 11025.0965982163. The cubic root of 121552755 is about 495.3607613946.

The spelling of 121552755 in words is "one hundred twenty-one million, five hundred fifty-two thousand, seven hundred fifty-five".