120808551 has 4 divisors (see below), whose sum is σ = 161078072. Its totient is φ = 80539032.

The previous prime is 120808531. The next prime is 120808561. The reversal of 120808551 is 155808021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155808021 = 3 ⋅51936007.

It is not a de Polignac number, because 120808551 - 2²¹ = 118711399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120808531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20134756 + ... + 20134761.

It is an arithmetic number, because the mean of its divisors is an integer number (40269518).

Almost surely, 2^120808551 is an apocalyptic number.

120808551 is a deficient number, since it is larger than the sum of its proper divisors (40269521).

120808551 is an equidigital number, since it uses as much as digits as its factorization.

120808551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40269520.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 120808551 is about 10991.2943277851. The cubic root of 120808551 is about 494.3477461571.

The spelling of 120808551 in words is "one hundred twenty million, eight hundred eight thousand, five hundred fifty-one".