1381963943 has 2 divisors, whose sum is σ = 1381963944. Its totient is φ = 1381963942.

The previous prime is 1381963927. The next prime is 1381963981. The reversal of 1381963943 is 3493691831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1381963943 - 2⁴ = 1381963927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381962943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690981971 + 690981972.

It is an arithmetic number, because the mean of its divisors is an integer number (690981972).

Almost surely, 2^1381963943 is an apocalyptic number.

1381963943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381963943 is an equidigital number, since it uses as much as digits as its factorization.

1381963943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 47.

The square root of 1381963943 is about 37174.7756281057. The cubic root of 1381963943 is about 1113.8641782758.

The spelling of 1381963943 in words is "one billion, three hundred eighty-one million, nine hundred sixty-three thousand, nine hundred forty-three".