636112122131 has 4 divisors (see below), whose sum is σ = 636114832872. Its totient is φ = 636109411392.

The previous prime is 636112122089. The next prime is 636112122221. The reversal of 636112122131 is 131221211636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 636112122131 - 2⁶ = 636112122067 is a prime.

It is a super-2 number, since 2×636112122131² (a number of 24 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 = 636112122094 and 636112122103.

It is not an unprimeable number, because it can be changed into a prime (636112122031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966110 + ... + 1485123.

It is an arithmetic number, because the mean of its divisors is an integer number (159028708218).

Almost surely, 2^636112122131 is an apocalyptic number.

636112122131 is a deficient number, since it is larger than the sum of its proper divisors (2710741).

636112122131 is a wasteful number, since it uses less digits than its factorization.

636112122131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710740.

The product of its digits is 2592, while the sum is 29.

Adding to 636112122131 its reverse (131221211636), we get a palindrome (767333333767).

The spelling of 636112122131 in words is "six hundred thirty-six billion, one hundred twelve million, one hundred twenty-two thousand, one hundred thirty-one".