1191907489 has 2 divisors, whose sum is σ = 1191907490. Its totient is φ = 1191907488.

The previous prime is 1191907469. The next prime is 1191907531. The reversal of 1191907489 is 9847091911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 954501025 + 237406464 = 30895^2 + 15408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191907489 - 2¹¹ = 1191905441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191907469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595953744 + 595953745.

It is an arithmetic number, because the mean of its divisors is an integer number (595953745).

Almost surely, 2^1191907489 is an apocalyptic number.

It is an amenable number.

1191907489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191907489 is an equidigital number, since it uses as much as digits as its factorization.

1191907489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 49.

The square root of 1191907489 is about 34524.0132226831. The cubic root of 1191907489 is about 1060.2644080523.

The spelling of 1191907489 in words is "one billion, one hundred ninety-one million, nine hundred seven thousand, four hundred eighty-nine".