11650781231 has 4 divisors (see below), whose sum is σ = 11650999464. Its totient is φ = 11650563000.

The previous prime is 11650781227. The next prime is 11650781257. The reversal of 11650781231 is 13218705611.

11650781231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13218705611 = 307 ⋅43057673.

It is a cyclic number.

It is not a de Polignac number, because 11650781231 - 2² = 11650781227 is a prime.

It is a super-2 number, since 2×11650781231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11650781191 and 11650781200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11650781221) 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 in 3 ways as a sum of consecutive naturals, for example, 30581 + ... + 155681.

It is an arithmetic number, because the mean of its divisors is an integer number (2912749866).

Almost surely, 2^11650781231 is an apocalyptic number.

11650781231 is a deficient number, since it is larger than the sum of its proper divisors (218233).

11650781231 is an equidigital number, since it uses as much as digits as its factorization.

11650781231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218232.

The product of its (nonzero) digits is 10080, while the sum is 35.

The spelling of 11650781231 in words is "eleven billion, six hundred fifty million, seven hundred eighty-one thousand, two hundred thirty-one".