1128247949 has 4 divisors (see below), whose sum is σ = 1187629440. Its totient is φ = 1068866460.

The previous prime is 1128247943. The next prime is 1128247951. The reversal of 1128247949 is 9497428211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9497428211 = 283 ⋅33559817.

It is a cyclic number.

It is not a de Polignac number, because 1128247949 - 2⁴ = 1128247933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128247943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29690717 + ... + 29690754.

It is an arithmetic number, because the mean of its divisors is an integer number (296907360).

Almost surely, 2^1128247949 is an apocalyptic number.

1128247949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1128247949 is a deficient number, since it is larger than the sum of its proper divisors (59381491).

1128247949 is an equidigital number, since it uses as much as digits as its factorization.

1128247949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59381490.

The product of its digits is 290304, while the sum is 47.

The square root of 1128247949 is about 33589.4023316879. The cubic root of 1128247949 is about 1041.0418396597.

The spelling of 1128247949 in words is "one billion, one hundred twenty-eight million, two hundred forty-seven thousand, nine hundred forty-nine".