1323103511381 has 2 divisors, whose sum is σ = 1323103511382. Its totient is φ = 1323103511380.

The previous prime is 1323103511371. The next prime is 1323103511407. The reversal of 1323103511381 is 1831153013231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1169839091281 + 153264420100 = 1081591^2 + 391490^2 .

It is an emirp because it is prime and its reverse (1831153013231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1323103511381 - 2²⁶ = 1323036402517 is a prime.

It is a super-2 number, since 2×1323103511381² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323103511311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661551755690 + 661551755691.

It is an arithmetic number, because the mean of its divisors is an integer number (661551755691).

Almost surely, 2^{1323103511381} is an apocalyptic number.

It is an amenable number.

1323103511381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323103511381 is an equidigital number, since it uses as much as digits as its factorization.

1323103511381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 1323103511381 in words is "one trillion, three hundred twenty-three billion, one hundred three million, five hundred eleven thousand, three hundred eighty-one".