1128795749 has 4 divisors (see below), whose sum is σ = 1150093836. Its totient is φ = 1107497664.

The previous prime is 1128795727. The next prime is 1128795769. The reversal of 1128795749 is 9475978211.

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 717436225 + 411359524 = 26785^2 + 20282^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128795749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 21298033 = 1128795749 / (1 + 1 + 2 + 8 + 7 + 9 + 5 + 7 + 4 + 9).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1128795749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128795769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10648964 + ... + 10649069.

It is an arithmetic number, because the mean of its divisors is an integer number (287523459).

Almost surely, 2^1128795749 is an apocalyptic number.

It is an amenable number.

1128795749 is a deficient number, since it is larger than the sum of its proper divisors (21298087).

1128795749 is an equidigital number, since it uses as much as digits as its factorization.

1128795749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21298086.

The product of its digits is 1270080, while the sum is 53.

The square root of 1128795749 is about 33597.5556997827. Note that the first 3 decimals coincide. The cubic root of 1128795749 is about 1041.2102986255.

The spelling of 1128795749 in words is "one billion, one hundred twenty-eight million, seven hundred ninety-five thousand, seven hundred forty-nine".