11531257193 has 2 divisors, whose sum is σ = 11531257194. Its totient is φ = 11531257192.

The previous prime is 11531257189. The next prime is 11531257217. The reversal of 11531257193 is 39175213511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6044596009 + 5486661184 = 77747^2 + 74072^2 .

It is a cyclic number.

It is not a de Polignac number, because 11531257193 - 2² = 11531257189 is a prime.

It is a super-2 number, since 2×11531257193² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11531257693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765628596 + 5765628597.

It is an arithmetic number, because the mean of its divisors is an integer number (5765628597).

Almost surely, 2^11531257193 is an apocalyptic number.

It is an amenable number.

11531257193 is a deficient number, since it is larger than the sum of its proper divisors (1).

11531257193 is an equidigital number, since it uses as much as digits as its factorization.

11531257193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 38.

The spelling of 11531257193 in words is "eleven billion, five hundred thirty-one million, two hundred fifty-seven thousand, one hundred ninety-three".