1128691263 has 16 divisors (see below), whose sum is σ = 1720737536. Its totient is φ = 644656320.

The previous prime is 1128691243. The next prime is 1128691273. The reversal of 1128691263 is 3621968211.

It is not a de Polignac number, because 1128691263 - 2¹² = 1128687167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128691243) 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 15 ways as a sum of consecutive naturals, for example, 36120 + ... + 59682.

It is an arithmetic number, because the mean of its divisors is an integer number (107546096).

Almost surely, 2^1128691263 is an apocalyptic number.

1128691263 is a deficient number, since it is larger than the sum of its proper divisors (592046273).

1128691263 is a wasteful number, since it uses less digits than its factorization.

1128691263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25854.

The product of its digits is 31104, while the sum is 39.

The square root of 1128691263 is about 33596.0006994880. Note that the first 3 decimals coincide. The cubic root of 1128691263 is about 1041.1781713913.

The spelling of 1128691263 in words is "one billion, one hundred twenty-eight million, six hundred ninety-one thousand, two hundred sixty-three".