1151111111 has 2 divisors, whose sum is σ = 1151111112. Its totient is φ = 1151111110.

The previous prime is 1151111083. The next prime is 1151111131. The reversal of 1151111111 is 1111111511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1151111111 is a prime.

1151111111 is a modest number, since divided by 111111 gives 1151 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1151111131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 575555555 + 575555556.

It is an arithmetic number, because the mean of its divisors is an integer number (575555556).

Almost surely, 2^1151111111 is an apocalyptic number.

1151111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1151111111 is an equidigital number, since it uses as much as digits as its factorization.

1151111111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5, while the sum is 14.

The square root of 1151111111 is about 33928.0283983611. The cubic root of 1151111111 is about 1048.0268646722.

Adding to 1151111111 its reverse (1111111511), we get a palindrome (2262222622).

It can be divided in two parts, 11511 and 11111, that multiplied together give a palindrome (127898721).

The spelling of 1151111111 in words is "one billion, one hundred fifty-one million, one hundred eleven thousand, one hundred eleven".