120555551 has 16 divisors (see below), whose sum is σ = 134991360. Its totient is φ = 106992000.

The previous prime is 120555527. The next prime is 120555553. The reversal of 120555551 is 155555021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120555551 is a prime.

It is a super-3 number, since 3×120555551³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120555553) 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, 80330 + ... + 81816.

It is an arithmetic number, because the mean of its divisors is an integer number (8436960).

Almost surely, 2^120555551 is an apocalyptic number.

120555551 is a deficient number, since it is larger than the sum of its proper divisors (14435809).

120555551 is a wasteful number, since it uses less digits than its factorization.

120555551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774.

The product of its (nonzero) digits is 6250, while the sum is 29.

The square root of 120555551 is about 10979.7791872150. The cubic root of 120555551 is about 494.0024135665.

The spelling of 120555551 in words is "one hundred twenty million, five hundred fifty-five thousand, five hundred fifty-one".