1120256661 has 4 divisors (see below), whose sum is σ = 1493675552. Its totient is φ = 746837772.

The previous prime is 1120256651. The next prime is 1120256677. The reversal of 1120256661 is 1666520211.

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: 1666520211 = 3 ⋅555506737.

It is not a de Polignac number, because 1120256661 - 2⁵ = 1120256629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1120256651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186709441 + ... + 186709446.

It is an arithmetic number, because the mean of its divisors is an integer number (373418888).

Almost surely, 2^1120256661 is an apocalyptic number.

It is an amenable number.

1120256661 is a deficient number, since it is larger than the sum of its proper divisors (373418891).

1120256661 is an equidigital number, since it uses as much as digits as its factorization.

1120256661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373418890.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1120256661 is about 33470.2354488283. The cubic root of 1120256661 is about 1038.5781423309.

Adding to 1120256661 its reverse (1666520211), we get a palindrome (2786776872).

The spelling of 1120256661 in words is "one billion, one hundred twenty million, two hundred fifty-six thousand, six hundred sixty-one".