11591287397 has 2 divisors, whose sum is σ = 11591287398. Its totient is φ = 11591287396.

The previous prime is 11591287343. The next prime is 11591287451. The reversal of 11591287397 is 79378219511.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (11591287343) and next prime (11591287451).

It can be written as a sum of positive squares in only one way, i.e., 9354564961 + 2236722436 = 96719^2 + 47294^2 .

It is an emirp because it is prime and its reverse (79378219511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11591287397 - 2¹⁰ = 11591286373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11591287297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5795643698 + 5795643699.

It is an arithmetic number, because the mean of its divisors is an integer number (5795643699).

Almost surely, 2^11591287397 is an apocalyptic number.

It is an amenable number.

11591287397 is a deficient number, since it is larger than the sum of its proper divisors (1).

11591287397 is an equidigital number, since it uses as much as digits as its factorization.

11591287397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 53.

The spelling of 11591287397 in words is "eleven billion, five hundred ninety-one million, two hundred eighty-seven thousand, three hundred ninety-seven".