1128156947 has 2 divisors, whose sum is σ = 1128156948. Its totient is φ = 1128156946.

The previous prime is 1128156889. The next prime is 1128157021. The reversal of 1128156947 is 7496518211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1128156947 - 2⁸ = 1128156691 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1128156898 and 1128156907.

It is not a weakly prime, because it can be changed into another prime (1128156047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564078473 + 564078474.

It is an arithmetic number, because the mean of its divisors is an integer number (564078474).

Almost surely, 2^1128156947 is an apocalyptic number.

1128156947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128156947 is an equidigital number, since it uses as much as digits as its factorization.

1128156947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 1128156947 is about 33588.0476806855. The cubic root of 1128156947 is about 1041.0138495249.

The spelling of 1128156947 in words is "one billion, one hundred twenty-eight million, one hundred fifty-six thousand, nine hundred forty-seven".