1188778867 has 2 divisors, whose sum is σ = 1188778868. Its totient is φ = 1188778866.

The previous prime is 1188778861. The next prime is 1188778901. The reversal of 1188778867 is 7688778811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1188778867 - 2⁷ = 1188778739 is a prime.

It is not a weakly prime, because it can be changed into another prime (1188778861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594389433 + 594389434.

It is an arithmetic number, because the mean of its divisors is an integer number (594389434).

Almost surely, 2^1188778867 is an apocalyptic number.

1188778867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188778867 is an equidigital number, since it uses as much as digits as its factorization.

1188778867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8429568, while the sum is 61.

The square root of 1188778867 is about 34478.6726397638. The cubic root of 1188778867 is about 1059.3359038916.

The spelling of 1188778867 in words is "one billion, one hundred eighty-eight million, seven hundred seventy-eight thousand, eight hundred sixty-seven".