1191967853 has 2 divisors, whose sum is σ = 1191967854. Its totient is φ = 1191967852.

The previous prime is 1191967837. The next prime is 1191967901. The reversal of 1191967853 is 3587691911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 958397764 + 233570089 = 30958^2 + 15283^2 .

It is an emirp because it is prime and its reverse (3587691911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191967853 - 2⁴ = 1191967837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191960853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595983926 + 595983927.

It is an arithmetic number, because the mean of its divisors is an integer number (595983927).

Almost surely, 2^1191967853 is an apocalyptic number.

It is an amenable number.

1191967853 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191967853 is an equidigital number, since it uses as much as digits as its factorization.

1191967853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 1191967853 is about 34524.8874436978. The cubic root of 1191967853 is about 1060.2823067345.

The spelling of 1191967853 in words is "one billion, one hundred ninety-one million, nine hundred sixty-seven thousand, eight hundred fifty-three".