1191880247 has 2 divisors, whose sum is σ = 1191880248. Its totient is φ = 1191880246.

The previous prime is 1191880243. The next prime is 1191880303. The reversal of 1191880247 is 7420881911.

It is a weak prime.

It is an emirp because it is prime and its reverse (7420881911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191880247 - 2² = 1191880243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191880243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595940123 + 595940124.

It is an arithmetic number, because the mean of its divisors is an integer number (595940124).

Almost surely, 2^1191880247 is an apocalyptic number.

1191880247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191880247 is an equidigital number, since it uses as much as digits as its factorization.

1191880247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 1191880247 is about 34523.6186834463. The cubic root of 1191880247 is about 1060.2563302601.

The spelling of 1191880247 in words is "one billion, one hundred ninety-one million, eight hundred eighty thousand, two hundred forty-seven".