1111156789 has 2 divisors, whose sum is σ = 1111156790. Its totient is φ = 1111156788.

The previous prime is 1111156763. The next prime is 1111156799. The reversal of 1111156789 is 9876511111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927689764 + 183467025 = 30458^2 + 13545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1111156789 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111156759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555578394 + 555578395.

It is an arithmetic number, because the mean of its divisors is an integer number (555578395).

Almost surely, 2^1111156789 is an apocalyptic number.

It is an amenable number.

1111156789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111156789 is an equidigital number, since it uses as much as digits as its factorization.

1111156789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 40.

The square root of 1111156789 is about 33334.0184946250. The cubic root of 1111156789 is about 1035.7583616389.

The spelling of 1111156789 in words is "one billion, one hundred eleven million, one hundred fifty-six thousand, seven hundred eighty-nine".