936135186821 has 2 divisors, whose sum is σ = 936135186822. Its totient is φ = 936135186820.

The previous prime is 936135186817. The next prime is 936135186887. The reversal of 936135186821 is 128681531639.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 929847489796 + 6287697025 = 964286^2 + 79295^2 .

It is a cyclic number.

It is not a de Polignac number, because 936135186821 - 2² = 936135186817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (936135183821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 468067593410 + 468067593411.

It is an arithmetic number, because the mean of its divisors is an integer number (468067593411).

Almost surely, 2^936135186821 is an apocalyptic number.

It is an amenable number.

936135186821 is a deficient number, since it is larger than the sum of its proper divisors (1).

936135186821 is an equidigital number, since it uses as much as digits as its factorization.

936135186821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The spelling of 936135186821 in words is "nine hundred thirty-six billion, one hundred thirty-five million, one hundred eighty-six thousand, eight hundred twenty-one".