1120166521 has 4 divisors (see below), whose sum is σ = 1121177700. Its totient is φ = 1119155344.

The previous prime is 1120166497. The next prime is 1120166561. The reversal of 1120166521 is 1256610211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1256610211 = 2131 ⋅589681.

It can be written as a sum of positive squares in 2 ways, for example, as 340919296 + 779247225 = 18464^2 + 27915^2 .

It is a cyclic number.

It is not a de Polignac number, because 1120166521 - 2⁷ = 1120166393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1120166561) 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, 503926 + ... + 506143.

It is an arithmetic number, because the mean of its divisors is an integer number (280294425).

Almost surely, 2^1120166521 is an apocalyptic number.

It is an amenable number.

1120166521 is a deficient number, since it is larger than the sum of its proper divisors (1011179).

1120166521 is a wasteful number, since it uses less digits than its factorization.

1120166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011178.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1120166521 is about 33468.8888521863. Note that the first 4 decimals coincide. The cubic root of 1120166521 is about 1038.5502856358.

Adding to 1120166521 its reverse (1256610211), we get a palindrome (2376776732).

The spelling of 1120166521 in words is "one billion, one hundred twenty million, one hundred sixty-six thousand, five hundred twenty-one".