30531821121181 has 2 divisors, whose sum is σ = 30531821121182. Its totient is φ = 30531821121180.

The previous prime is 30531821121169. The next prime is 30531821121247. The reversal of 30531821121181 is 18112112813503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29591097652900 + 940723468281 = 5439770^2 + 969909^2 .

It is a cyclic number.

It is not a de Polignac number, because 30531821121181 - 2⁵ = 30531821121149 is a prime.

It is a super-2 number, since 2×30531821121181² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30531821121181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30531821121481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15265910560590 + 15265910560591.

It is an arithmetic number, because the mean of its divisors is an integer number (15265910560591).

Almost surely, 2^{30531821121181} is an apocalyptic number.

It is an amenable number.

30531821121181 is a deficient number, since it is larger than the sum of its proper divisors (1).

30531821121181 is an equidigital number, since it uses as much as digits as its factorization.

30531821121181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 37.

Adding to 30531821121181 its reverse (18112112813503), we get a palindrome (48643933934684).

The spelling of 30531821121181 in words is "thirty trillion, five hundred thirty-one billion, eight hundred twenty-one million, one hundred twenty-one thousand, one hundred eighty-one".