1381624368121 has 2 divisors, whose sum is σ = 1381624368122. Its totient is φ = 1381624368120.

The previous prime is 1381624368073. The next prime is 1381624368181. The reversal of 1381624368121 is 1218634261831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 832773054096 + 548851314025 = 912564^2 + 740845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381624368121 - 2²¹ = 1381622270969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1381624368181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690812184060 + 690812184061.

It is an arithmetic number, because the mean of its divisors is an integer number (690812184061).

Almost surely, 2^{1381624368121} is an apocalyptic number.

It is an amenable number.

1381624368121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381624368121 is an equidigital number, since it uses as much as digits as its factorization.

1381624368121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 46.

The spelling of 1381624368121 in words is "one trillion, three hundred eighty-one billion, six hundred twenty-four million, three hundred sixty-eight thousand, one hundred twenty-one".