11231320157 has 2 divisors, whose sum is σ = 11231320158. Its totient is φ = 11231320156.

The previous prime is 11231320073. The next prime is 11231320159. The reversal of 11231320157 is 75102313211.

11231320157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9084758596 + 2146561561 = 95314^2 + 46331^2 .

It is an emirp because it is prime and its reverse (75102313211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11231320157 - 2⁸ = 11231319901 is a prime.

It is a super-2 number, since 2×11231320157² (a number of 21 digits) contains 22 as substring.

Together with 11231320159, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11231320159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615660078 + 5615660079.

It is an arithmetic number, because the mean of its divisors is an integer number (5615660079).

Almost surely, 2^11231320157 is an apocalyptic number.

It is an amenable number.

11231320157 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231320157 is an equidigital number, since it uses as much as digits as its factorization.

11231320157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 26.

Adding to 11231320157 its reverse (75102313211), we get a palindrome (86333633368).

The spelling of 11231320157 in words is "eleven billion, two hundred thirty-one million, three hundred twenty thousand, one hundred fifty-seven".