1381420189 has 2 divisors, whose sum is σ = 1381420190. Its totient is φ = 1381420188.

The previous prime is 1381420129. The next prime is 1381420207. The reversal of 1381420189 is 9810241831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1360872100 + 20548089 = 36890^2 + 4533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381420189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381420129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690710094 + 690710095.

It is an arithmetic number, because the mean of its divisors is an integer number (690710095).

Almost surely, 2^1381420189 is an apocalyptic number.

It is an amenable number.

1381420189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381420189 is an equidigital number, since it uses as much as digits as its factorization.

1381420189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1381420189 is about 37167.4614279749. The cubic root of 1381420189 is about 1113.7180703741.

The spelling of 1381420189 in words is "one billion, three hundred eighty-one million, four hundred twenty thousand, one hundred eighty-nine".