1161115011 has 36 divisors (see below), whose sum is σ = 2036176272. Its totient is φ = 624455424.

The previous prime is 1161114991. The next prime is 1161115037. The reversal of 1161115011 is 1105111611.

It is a happy number.

1161115011 is a `hidden beast` number, since 1 + 1 + 611 + 1 + 50 + 1 + 1 = 666.

It is not a de Polignac number, because 1161115011 - 2¹³ = 1161106819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161115211) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13680 + ... + 50093.

It is an arithmetic number, because the mean of its divisors is an integer number (56560452).

Almost surely, 2^1161115011 is an apocalyptic number.

1161115011 is a deficient number, since it is larger than the sum of its proper divisors (875061261).

1161115011 is a wasteful number, since it uses less digits than its factorization.

1161115011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63820 (or 63800 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 18.

The square root of 1161115011 is about 34075.1377253270. The cubic root of 1161115011 is about 1051.0541223374.

Adding to 1161115011 its reverse (1105111611), we get a palindrome (2266226622).

The spelling of 1161115011 in words is "one billion, one hundred sixty-one million, one hundred fifteen thousand, eleven".