1201131320981 has 2 divisors, whose sum is σ = 1201131320982. Its totient is φ = 1201131320980.

The previous prime is 1201131320969. The next prime is 1201131321053. The reversal of 1201131320981 is 1890231311021.

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., 1199552848081 + 1578472900 = 1095241^2 + 39730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201131320981 is a prime.

It is a super-2 number, since 2×1201131320981² (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 (1201131320881) 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, 600565660490 + 600565660491.

It is an arithmetic number, because the mean of its divisors is an integer number (600565660491).

Almost surely, 2^{1201131320981} is an apocalyptic number.

It is an amenable number.

1201131320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201131320981 is an equidigital number, since it uses as much as digits as its factorization.

1201131320981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 32.

The spelling of 1201131320981 in words is "one trillion, two hundred one billion, one hundred thirty-one million, three hundred twenty thousand, nine hundred eighty-one".