120723561 has 32 divisors (see below), whose sum is σ = 205587200. Its totient is φ = 68584320.

The previous prime is 120723539. The next prime is 120723593. The reversal of 120723561 is 165327021.

It is a happy number.

It is not a de Polignac number, because 120723561 - 2⁶ = 120723497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (120723061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32445 + ... + 35973.

It is an arithmetic number, because the mean of its divisors is an integer number (6424600).

Almost surely, 2^120723561 is an apocalyptic number.

It is an amenable number.

120723561 is a deficient number, since it is larger than the sum of its proper divisors (84863639).

120723561 is a wasteful number, since it uses less digits than its factorization.

120723561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726 (or 3720 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 120723561 is about 10987.4274059035. The cubic root of 120723561 is about 494.2317927994.

The spelling of 120723561 in words is "one hundred twenty million, seven hundred twenty-three thousand, five hundred sixty-one".