120155557 has 2 divisors, whose sum is σ = 120155558. Its totient is φ = 120155556.

The previous prime is 120155551. The next prime is 120155561. The reversal of 120155557 is 755551021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112169281 + 7986276 = 10591^2 + 2826^2 .

It is an emirp because it is prime and its reverse (755551021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120155557 - 2¹⁹ = 119631269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120155551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60077778 + 60077779.

It is an arithmetic number, because the mean of its divisors is an integer number (60077779).

Almost surely, 2^120155557 is an apocalyptic number.

It is an amenable number.

120155557 is a deficient number, since it is larger than the sum of its proper divisors (1).

120155557 is an equidigital number, since it uses as much as digits as its factorization.

120155557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 120155557 is about 10961.5490237466. The cubic root of 120155557 is about 493.4554542553.

The spelling of 120155557 in words is "one hundred twenty million, one hundred fifty-five thousand, five hundred fifty-seven".