1128285391 has 2 divisors, whose sum is σ = 1128285392. Its totient is φ = 1128285390.

The previous prime is 1128285377. The next prime is 1128285469. The reversal of 1128285391 is 1935828211.

It is a weak prime.

It is an emirp because it is prime and its reverse (1935828211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128285391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1128285311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564142695 + 564142696.

It is an arithmetic number, because the mean of its divisors is an integer number (564142696).

Almost surely, 2^1128285391 is an apocalyptic number.

1128285391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128285391 is an equidigital number, since it uses as much as digits as its factorization.

1128285391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 40.

The square root of 1128285391 is about 33589.9596754745. The cubic root of 1128285391 is about 1041.0533555260.

The spelling of 1128285391 in words is "one billion, one hundred twenty-eight million, two hundred eighty-five thousand, three hundred ninety-one".