1191147864637 has 2 divisors, whose sum is σ = 1191147864638. Its totient is φ = 1191147864636.

The previous prime is 1191147864607. The next prime is 1191147864703. The reversal of 1191147864637 is 7364687411911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021526618436 + 169621246201 = 1010706^2 + 411851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191147864637 - 2⁷ = 1191147864509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191147864607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595573932318 + 595573932319.

It is an arithmetic number, because the mean of its divisors is an integer number (595573932319).

Almost surely, 2^{1191147864637} is an apocalyptic number.

It is an amenable number.

1191147864637 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191147864637 is an equidigital number, since it uses as much as digits as its factorization.

1191147864637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 58.

The spelling of 1191147864637 in words is "one trillion, one hundred ninety-one billion, one hundred forty-seven million, eight hundred sixty-four thousand, six hundred thirty-seven".