1121015665 has 64 divisors (see below), whose sum is σ = 1714618368. Its totient is φ = 683424000.

The previous prime is 1121015647. The next prime is 1121015669. The reversal of 1121015665 is 5665101211.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1121015665 is a prime.

It is a super-2 number, since 2×1121015665² = 2513352242350784450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121015669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4938282 + ... + 4938508.

It is an arithmetic number, because the mean of its divisors is an integer number (26790912).

Almost surely, 2^1121015665 is an apocalyptic number.

It is an amenable number.

1121015665 is a deficient number, since it is larger than the sum of its proper divisors (593602703).

1121015665 is a wasteful number, since it uses less digits than its factorization.

1121015665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1121015665 is about 33481.5720210387. The cubic root of 1121015665 is about 1038.8126442478.

Adding to 1121015665 its reverse (5665101211), we get a palindrome (6786116876).

The spelling of 1121015665 in words is "one billion, one hundred twenty-one million, fifteen thousand, six hundred sixty-five".