1128561913 has 8 divisors (see below), whose sum is σ = 1186949376. Its totient is φ = 1071548400.

The previous prime is 1128561887. The next prime is 1128561937. The reversal of 1128561913 is 3191658211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1128561913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1128561713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341803 + ... + 345088.

It is an arithmetic number, because the mean of its divisors is an integer number (148368672).

Almost surely, 2^1128561913 is an apocalyptic number.

It is an amenable number.

1128561913 is a deficient number, since it is larger than the sum of its proper divisors (58387463).

1128561913 is an equidigital number, since it uses as much as digits as its factorization.

1128561913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686975.

The product of its digits is 12960, while the sum is 37.

The square root of 1128561913 is about 33594.0755640038. The cubic root of 1128561913 is about 1041.1383962565.

The spelling of 1128561913 in words is "one billion, one hundred twenty-eight million, five hundred sixty-one thousand, nine hundred thirteen".