120347561 has 4 divisors (see below), whose sum is σ = 120732372. Its totient is φ = 119962752.

The previous prime is 120347533. The next prime is 120347567. The reversal of 120347561 is 165743021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165743021 = 8641 ⋅19181.

It can be written as a sum of positive squares in 2 ways, for example, as 51208336 + 69139225 = 7156^2 + 8315^2 .

It is a cyclic number.

It is not a de Polignac number, because 120347561 - 2¹⁰ = 120346537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120347567) 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, 191936 + ... + 192561.

It is an arithmetic number, because the mean of its divisors is an integer number (30183093).

Almost surely, 2^120347561 is an apocalyptic number.

It is an amenable number.

120347561 is a deficient number, since it is larger than the sum of its proper divisors (384811).

120347561 is an equidigital number, since it uses as much as digits as its factorization.

120347561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384810.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 120347561 is about 10970.3035965282. The cubic root of 120347561 is about 493.7181553782.

The spelling of 120347561 in words is "one hundred twenty million, three hundred forty-seven thousand, five hundred sixty-one".