31330221001181 has 2 divisors, whose sum is σ = 31330221001182. Its totient is φ = 31330221001180.

The previous prime is 31330221001133. The next prime is 31330221001223. The reversal of 31330221001181 is 18110012203313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27374776232281 + 3955444768900 = 5232091^2 + 1988830^2 .

It is a cyclic number.

It is not a de Polignac number, because 31330221001181 - 2¹⁰ = 31330221000157 is a prime.

It is a super-2 number, since 2×31330221001181² (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 31330221001181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31330221031181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665110500590 + 15665110500591.

It is an arithmetic number, because the mean of its divisors is an integer number (15665110500591).

Almost surely, 2^{31330221001181} is an apocalyptic number.

It is an amenable number.

31330221001181 is a deficient number, since it is larger than the sum of its proper divisors (1).

31330221001181 is an equidigital number, since it uses as much as digits as its factorization.

31330221001181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

Adding to 31330221001181 its reverse (18110012203313), we get a palindrome (49440233204494).

The spelling of 31330221001181 in words is "thirty-one trillion, three hundred thirty billion, two hundred twenty-one million, one thousand, one hundred eighty-one".