1121606865 has 32 divisors (see below), whose sum is σ = 2042611200. Its totient is φ = 583597440.

The previous prime is 1121606833. The next prime is 1121606881. The reversal of 1121606865 is 5686061211.

It is not a de Polignac number, because 1121606865 - 2⁵ = 1121606833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95785 + ... + 106854.

It is an arithmetic number, because the mean of its divisors is an integer number (63831600).

Almost surely, 2^1121606865 is an apocalyptic number.

1121606865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121606865 is a deficient number, since it is larger than the sum of its proper divisors (921004335).

1121606865 is a wasteful number, since it uses less digits than its factorization.

1121606865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202694 (or 202688 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1121606865 is about 33490.3995945107. The cubic root of 1121606865 is about 1038.9952281086.

It can be divided in two parts, 112160 and 6865, that added together give a square (119025 = 345²).

The spelling of 1121606865 in words is "one billion, one hundred twenty-one million, six hundred six thousand, eight hundred sixty-five".