1128642979 has 2 divisors, whose sum is σ = 1128642980. Its totient is φ = 1128642978.

The previous prime is 1128642941. The next prime is 1128642989. The reversal of 1128642979 is 9792468211.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128642979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1128642929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564321489 + 564321490.

It is an arithmetic number, because the mean of its divisors is an integer number (564321490).

Almost surely, 2^1128642979 is an apocalyptic number.

1128642979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128642979 is an equidigital number, since it uses as much as digits as its factorization.

1128642979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 1128642979 is about 33595.2820943656. The cubic root of 1128642979 is about 1041.1633244131.

The spelling of 1128642979 in words is "one billion, one hundred twenty-eight million, six hundred forty-two thousand, nine hundred seventy-nine".