120644551 has 2 divisors, whose sum is σ = 120644552. Its totient is φ = 120644550.

The previous prime is 120644543. The next prime is 120644599. The reversal of 120644551 is 155446021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 120644551 - 2³ = 120644543 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120644351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60322275 + 60322276.

It is an arithmetic number, because the mean of its divisors is an integer number (60322276).

Almost surely, 2^120644551 is an apocalyptic number.

120644551 is a deficient number, since it is larger than the sum of its proper divisors (1).

120644551 is an equidigital number, since it uses as much as digits as its factorization.

120644551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 120644551 is about 10983.8313442988. The cubic root of 120644551 is about 494.1239492391.

The spelling of 120644551 in words is "one hundred twenty million, six hundred forty-four thousand, five hundred fifty-one".