120716561 has 4 divisors (see below), whose sum is σ = 137961792. Its totient is φ = 103471332.

The previous prime is 120716551. The next prime is 120716567. The reversal of 120716561 is 165617021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165617021 = 1901 ⋅87121.

It is a cyclic number.

It is not a de Polignac number, because 120716561 - 2¹⁰ = 120715537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120716567) 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, 8622605 + ... + 8622618.

It is an arithmetic number, because the mean of its divisors is an integer number (34490448).

Almost surely, 2^120716561 is an apocalyptic number.

It is an amenable number.

120716561 is a deficient number, since it is larger than the sum of its proper divisors (17245231).

120716561 is an equidigital number, since it uses as much as digits as its factorization.

120716561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17245230.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 120716561 is about 10987.1088553814. The cubic root of 120716561 is about 494.2222401504. Note that the first 4 decimals are identical.

The spelling of 120716561 in words is "one hundred twenty million, seven hundred sixteen thousand, five hundred sixty-one".