1120661561 has 8 divisors (see below), whose sum is σ = 1163270784. Its totient is φ = 1078834320.

The previous prime is 1120661557. The next prime is 1120661579. The reversal of 1120661561 is 1651660211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1120661561 - 2² = 1120661557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1120661551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192575 + ... + 198308.

It is an arithmetic number, because the mean of its divisors is an integer number (145408848).

Almost surely, 2^1120661561 is an apocalyptic number.

It is an amenable number.

1120661561 is a deficient number, since it is larger than the sum of its proper divisors (42609223).

1120661561 is an equidigital number, since it uses as much as digits as its factorization.

1120661561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390991.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 1120661561 is about 33476.2835601564. The cubic root of 1120661561 is about 1038.7032534330.

The spelling of 1120661561 in words is "one billion, one hundred twenty million, six hundred sixty-one thousand, five hundred sixty-one".