1121767785 has 40 divisors (see below), whose sum is σ = 2020556736. Its totient is φ = 595395360.

The previous prime is 1121767783. The next prime is 1121767819. The reversal of 1121767785 is 5877671211.

It is not a de Polignac number, because 1121767785 - 2¹ = 1121767783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121767785.

It is not an unprimeable number, because it can be changed into a prime (1121767781) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78892 + ... + 92018.

Almost surely, 2^1121767785 is an apocalyptic number.

1121767785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121767785 is a deficient number, since it is larger than the sum of its proper divisors (898788951).

1121767785 is a wasteful number, since it uses less digits than its factorization.

1121767785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13355 (or 13346 counting only the distinct ones).

The product of its digits is 164640, while the sum is 45.

The square root of 1121767785 is about 33492.8019878899. The cubic root of 1121767785 is about 1039.0449148934.

The spelling of 1121767785 in words is "one billion, one hundred twenty-one million, seven hundred sixty-seven thousand, seven hundred eighty-five".