1380206981 has 2 divisors, whose sum is σ = 1380206982. Its totient is φ = 1380206980.

The previous prime is 1380206963. The next prime is 1380207007. The reversal of 1380206981 is 1896020831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041094756 + 339112225 = 32266^2 + 18415^2 .

It is an emirp because it is prime and its reverse (1896020831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1380206981 - 2¹⁴ = 1380190597 is a prime.

It is a super-2 number, since 2×1380206981² = 3809942620802268722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380206281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690103490 + 690103491.

It is an arithmetic number, because the mean of its divisors is an integer number (690103491).

Almost surely, 2^1380206981 is an apocalyptic number.

It is an amenable number.

1380206981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380206981 is an equidigital number, since it uses as much as digits as its factorization.

1380206981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1380206981 is about 37151.1370081724. The cubic root of 1380206981 is about 1113.3919404429.

The spelling of 1380206981 in words is "one billion, three hundred eighty million, two hundred six thousand, nine hundred eighty-one".