1128117731 has 16 divisors (see below), whose sum is σ = 1273237056. Its totient is φ = 991727616.

The previous prime is 1128117707. The next prime is 1128117737. The reversal of 1128117731 is 1377118211.

It is not a de Polignac number, because 1128117731 - 2¹⁰ = 1128116707 is a prime.

It is a super-2 number, since 2×1128117731² = 2545299229993176722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1128117737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61571 + ... + 77763.

It is an arithmetic number, because the mean of its divisors is an integer number (79577316).

Almost surely, 2^1128117731 is an apocalyptic number.

1128117731 is a deficient number, since it is larger than the sum of its proper divisors (145119325).

1128117731 is a wasteful number, since it uses less digits than its factorization.

1128117731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16462.

The product of its digits is 2352, while the sum is 32.

The square root of 1128117731 is about 33587.4638965195. The cubic root of 1128117731 is about 1041.0017871157.

The spelling of 1128117731 in words is "one billion, one hundred twenty-eight million, one hundred seventeen thousand, seven hundred thirty-one".