1121566657 has 4 divisors (see below), whose sum is σ = 1129094100. Its totient is φ = 1114039216.

The previous prime is 1121566627. The next prime is 1121566669. The reversal of 1121566657 is 7566651211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 214593201 + 906973456 = 14649^2 + 30116^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121566657 is a prime.

It is a super-4 number, since 4×1121566657⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121566627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763498 + ... + 3763795.

It is an arithmetic number, because the mean of its divisors is an integer number (282273525).

Almost surely, 2^1121566657 is an apocalyptic number.

It is an amenable number.

1121566657 is a deficient number, since it is larger than the sum of its proper divisors (7527443).

1121566657 is an equidigital number, since it uses as much as digits as its factorization.

1121566657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527442.

The product of its digits is 75600, while the sum is 40.

The square root of 1121566657 is about 33489.7992976966. The cubic root of 1121566657 is about 1038.9828124632.

The spelling of 1121566657 in words is "one billion, one hundred twenty-one million, five hundred sixty-six thousand, six hundred fifty-seven".