120061561 has 2 divisors, whose sum is σ = 120061562. Its totient is φ = 120061560.

The previous prime is 120061553. The next prime is 120061649. The reversal of 120061561 is 165160021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112466025 + 7595536 = 10605^2 + 2756^2 .

It is a cyclic number.

It is not a de Polignac number, because 120061561 - 2³ = 120061553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120061261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60030780 + 60030781.

It is an arithmetic number, because the mean of its divisors is an integer number (60030781).

Almost surely, 2^120061561 is an apocalyptic number.

It is an amenable number.

120061561 is a deficient number, since it is larger than the sum of its proper divisors (1).

120061561 is an equidigital number, since it uses as much as digits as its factorization.

120061561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 120061561 is about 10957.2606521886. The cubic root of 120061561 is about 493.3267462699.

The spelling of 120061561 in words is "one hundred twenty million, sixty-one thousand, five hundred sixty-one".