120729561 has 4 divisors (see below), whose sum is σ = 160972752. Its totient is φ = 80486372.

The previous prime is 120729533. The next prime is 120729569. The reversal of 120729561 is 165927021.

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.

It is a cyclic number.

It is not a de Polignac number, because 120729561 - 2¹¹ = 120727513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120729569) 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, 20121591 + ... + 20121596.

It is an arithmetic number, because the mean of its divisors is an integer number (40243188).

Almost surely, 2^120729561 is an apocalyptic number.

It is an amenable number.

120729561 is a deficient number, since it is larger than the sum of its proper divisors (40243191).

120729561 is an equidigital number, since it uses as much as digits as its factorization.

120729561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40243190.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 120729561 is about 10987.7004418577. The cubic root of 120729561 is about 494.2399804904.

The spelling of 120729561 in words is "one hundred twenty million, seven hundred twenty-nine thousand, five hundred sixty-one".