1378489169 has 2 divisors, whose sum is σ = 1378489170. Its totient is φ = 1378489168.

The previous prime is 1378489129. The next prime is 1378489181. The reversal of 1378489169 is 9619848731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1271635600 + 106853569 = 35660^2 + 10337^2 .

It is a cyclic number.

It is not a de Polignac number, because 1378489169 - 2⁸ = 1378488913 is a prime.

It is a super-2 number, since 2×1378489169² = 3800464778100621122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1378489129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689244584 + 689244585.

It is an arithmetic number, because the mean of its divisors is an integer number (689244585).

Almost surely, 2^1378489169 is an apocalyptic number.

It is an amenable number.

1378489169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1378489169 is an equidigital number, since it uses as much as digits as its factorization.

1378489169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The square root of 1378489169 is about 37128.0105715348. The cubic root of 1378489169 is about 1112.9298377565.

The spelling of 1378489169 in words is "one billion, three hundred seventy-eight million, four hundred eighty-nine thousand, one hundred sixty-nine".