11191312537 has 2 divisors, whose sum is σ = 11191312538. Its totient is φ = 11191312536.

The previous prime is 11191312507. The next prime is 11191312567. The reversal of 11191312537 is 73521319111.

It is a balanced prime because it is at equal distance from previous prime (11191312507) and next prime (11191312567).

It can be written as a sum of positive squares in only one way, i.e., 11191312521 + 16 = 105789^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 11191312537 - 2⁷ = 11191312409 is a prime.

It is not a weakly prime, because it can be changed into another prime (11191312507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5595656268 + 5595656269.

It is an arithmetic number, because the mean of its divisors is an integer number (5595656269).

Almost surely, 2^11191312537 is an apocalyptic number.

It is an amenable number.

11191312537 is a deficient number, since it is larger than the sum of its proper divisors (1).

11191312537 is an equidigital number, since it uses as much as digits as its factorization.

11191312537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 34.

The spelling of 11191312537 in words is "eleven billion, one hundred ninety-one million, three hundred twelve thousand, five hundred thirty-seven".