120154561 has 2 divisors, whose sum is σ = 120154562. Its totient is φ = 120154560.

The previous prime is 120154501. The next prime is 120154571. The reversal of 120154561 is 165451021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71503936 + 48650625 = 8456^2 + 6975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120154561 is a prime.

It is a super-4 number, since 4×120154561⁴ (a number of 33 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (120154501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60077280 + 60077281.

It is an arithmetic number, because the mean of its divisors is an integer number (60077281).

Almost surely, 2^120154561 is an apocalyptic number.

It is an amenable number.

120154561 is a deficient number, since it is larger than the sum of its proper divisors (1).

120154561 is an equidigital number, since it uses as much as digits as its factorization.

120154561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 120154561 is about 10961.5035921173. The cubic root of 120154561 is about 493.4540907922.

The spelling of 120154561 in words is "one hundred twenty million, one hundred fifty-four thousand, five hundred sixty-one".