1161111133 has 16 divisors (see below), whose sum is σ = 1430912896. Its totient is φ = 917490240.

The previous prime is 1161111131. The next prime is 1161111137. The reversal of 1161111133 is 3311111611.

It is a cyclic number.

It is not a de Polignac number, because 1161111133 - 2¹ = 1161111131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1161111133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161111131) 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, 65935 + ... + 81667.

It is an arithmetic number, because the mean of its divisors is an integer number (89432056).

Almost surely, 2^1161111133 is an apocalyptic number.

1161111133 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1161111133 is a deficient number, since it is larger than the sum of its proper divisors (269801763).

1161111133 is a wasteful number, since it uses less digits than its factorization.

1161111133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16564.

The product of its digits is 54, while the sum is 19.

The square root of 1161111133 is about 34075.0808216210. The cubic root of 1161111133 is about 1051.0529521999.

Adding to 1161111133 its reverse (3311111611), we get a palindrome (4472222744).

The spelling of 1161111133 in words is "one billion, one hundred sixty-one million, one hundred eleven thousand, one hundred thirty-three".