1115779361 has 2 divisors, whose sum is σ = 1115779362. Its totient is φ = 1115779360.

The previous prime is 1115779337. The next prime is 1115779367. The reversal of 1115779361 is 1639775111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 837523600 + 278255761 = 28940^2 + 16681^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115779361 - 2¹⁰ = 1115778337 is a prime.

It is not a weakly prime, because it can be changed into another prime (1115779367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 557889680 + 557889681.

It is an arithmetic number, because the mean of its divisors is an integer number (557889681).

Almost surely, 2^1115779361 is an apocalyptic number.

It is an amenable number.

1115779361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1115779361 is an equidigital number, since it uses as much as digits as its factorization.

1115779361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39690, while the sum is 41.

The square root of 1115779361 is about 33403.2836858893. The cubic root of 1115779361 is about 1037.1926757235.

The spelling of 1115779361 in words is "one billion, one hundred fifteen million, seven hundred seventy-nine thousand, three hundred sixty-one".