1378197503981 has 2 divisors, whose sum is σ = 1378197503982. Its totient is φ = 1378197503980.

The previous prime is 1378197503971. The next prime is 1378197504001. The reversal of 1378197503981 is 1893057918731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1349047405225 + 29150098756 = 1161485^2 + 170734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1378197503981 is a prime.

It is a super-2 number, since 2×1378197503981² (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 (1378197503971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689098751990 + 689098751991.

It is an arithmetic number, because the mean of its divisors is an integer number (689098751991).

Almost surely, 2^{1378197503981} is an apocalyptic number.

It is an amenable number.

1378197503981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378197503981 is an equidigital number, since it uses as much as digits as its factorization.

1378197503981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 62.

The spelling of 1378197503981 in words is "one trillion, three hundred seventy-eight billion, one hundred ninety-seven million, five hundred three thousand, nine hundred eighty-one".