1191047287 has 2 divisors, whose sum is σ = 1191047288. Its totient is φ = 1191047286.

The previous prime is 1191047269. The next prime is 1191047293. The reversal of 1191047287 is 7827401911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191047287 - 2¹⁹ = 1190522999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191047267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595523643 + 595523644.

It is an arithmetic number, because the mean of its divisors is an integer number (595523644).

Almost surely, 2^1191047287 is an apocalyptic number.

1191047287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191047287 is an equidigital number, since it uses as much as digits as its factorization.

1191047287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 1191047287 is about 34511.5529497008. The cubic root of 1191047287 is about 1060.0092816916.

The spelling of 1191047287 in words is "one billion, one hundred ninety-one million, forty-seven thousand, two hundred eighty-seven".