1128736949 has 2 divisors, whose sum is σ = 1128736950. Its totient is φ = 1128736948.

The previous prime is 1128736909. The next prime is 1128736957. The reversal of 1128736949 is 9496378211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 857904100 + 270832849 = 29290^2 + 16457^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128736949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1128736897 and 1128736906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128736909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564368474 + 564368475.

It is an arithmetic number, because the mean of its divisors is an integer number (564368475).

Almost surely, 2^1128736949 is an apocalyptic number.

It is an amenable number.

1128736949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128736949 is an equidigital number, since it uses as much as digits as its factorization.

1128736949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 1128736949 is about 33596.6806247284. The cubic root of 1128736949 is about 1041.1922191136.

The spelling of 1128736949 in words is "one billion, one hundred twenty-eight million, seven hundred thirty-six thousand, nine hundred forty-nine".