1111157779 has 2 divisors, whose sum is σ = 1111157780. Its totient is φ = 1111157778.

The previous prime is 1111157777. The next prime is 1111157819. The reversal of 1111157779 is 9777511111.

It is an a-pointer prime, because the next prime (1111157819) can be obtained adding 1111157779 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111157779 - 2¹ = 1111157777 is a prime.

Together with 1111157777, it forms a pair of twin primes.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1111157771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555578889 + 555578890.

It is an arithmetic number, because the mean of its divisors is an integer number (555578890).

Almost surely, 2^1111157779 is an apocalyptic number.

1111157779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111157779 is an equidigital number, since it uses as much as digits as its factorization.

1111157779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15435, while the sum is 40.

The square root of 1111157779 is about 33334.0333443164. The cubic root of 1111157779 is about 1035.7586692464.

The spelling of 1111157779 in words is "one billion, one hundred eleven million, one hundred fifty-seven thousand, seven hundred seventy-nine".