120505551 has 8 divisors (see below), whose sum is σ = 161113344. Its totient is φ = 80117400.

The previous prime is 120505547. The next prime is 120505577. The reversal of 120505551 is 155505021.

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

It is not a de Polignac number, because 120505551 - 2² = 120505547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120505591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53625 + ... + 55826.

It is an arithmetic number, because the mean of its divisors is an integer number (20139168).

Almost surely, 2^120505551 is an apocalyptic number.

120505551 is a deficient number, since it is larger than the sum of its proper divisors (40607793).

120505551 is a wasteful number, since it uses less digits than its factorization.

120505551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109821.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 120505551 is about 10977.5020382599. The cubic root of 120505551 is about 493.9341088555.

The spelling of 120505551 in words is "one hundred twenty million, five hundred five thousand, five hundred fifty-one".