1011320020181 has 2 divisors, whose sum is σ = 1011320020182. Its totient is φ = 1011320020180.

The previous prime is 1011320020163. The next prime is 1011320020213. The reversal of 1011320020181 is 1810200231101.

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., 954274996900 + 57045023281 = 976870^2 + 238841^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011320020181 - 2¹⁸ = 1011319758037 is a prime.

It is a super-2 number, since 2×1011320020181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011328020181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505660010090 + 505660010091.

It is an arithmetic number, because the mean of its divisors is an integer number (505660010091).

Almost surely, 2^{1011320020181} is an apocalyptic number.

It is an amenable number.

1011320020181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011320020181 is an equidigital number, since it uses as much as digits as its factorization.

1011320020181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 1011320020181 its reverse (1810200231101), we get a palindrome (2821520251282).

The spelling of 1011320020181 in words is "one trillion, eleven billion, three hundred twenty million, twenty thousand, one hundred eighty-one".