1381853916181 has 2 divisors, whose sum is σ = 1381853916182. Its totient is φ = 1381853916180.

The previous prime is 1381853916103. The next prime is 1381853916263. The reversal of 1381853916181 is 1816193581831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983004829156 + 398849087025 = 991466^2 + 631545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381853916181 is a prime.

It is a super-2 number, since 2×1381853916181² (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 (1381853919181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690926958090 + 690926958091.

It is an arithmetic number, because the mean of its divisors is an integer number (690926958091).

Almost surely, 2^{1381853916181} is an apocalyptic number.

It is an amenable number.

1381853916181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381853916181 is an equidigital number, since it uses as much as digits as its factorization.

1381853916181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 55.

The spelling of 1381853916181 in words is "one trillion, three hundred eighty-one billion, eight hundred fifty-three million, nine hundred sixteen thousand, one hundred eighty-one".