1191049957 has 2 divisors, whose sum is σ = 1191049958. Its totient is φ = 1191049956.

The previous prime is 1191049919. The next prime is 1191049997. The reversal of 1191049957 is 7599401911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1104299361 + 86750596 = 33231^2 + 9314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1191049957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191049907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595524978 + 595524979.

It is an arithmetic number, because the mean of its divisors is an integer number (595524979).

Almost surely, 2^1191049957 is an apocalyptic number.

It is an amenable number.

1191049957 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191049957 is an equidigital number, since it uses as much as digits as its factorization.

1191049957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 46.

The square root of 1191049957 is about 34511.5916323777. The cubic root of 1191049957 is about 1060.0100737740.

The spelling of 1191049957 in words is "one billion, one hundred ninety-one million, forty-nine thousand, nine hundred fifty-seven".