1391449289 has 2 divisors, whose sum is σ = 1391449290. Its totient is φ = 1391449288.

The previous prime is 1391449273. The next prime is 1391449307. The reversal of 1391449289 is 9829441931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190802064 + 200647225 = 34508^2 + 14165^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391449289 - 2⁴ = 1391449273 is a prime.

It is a super-2 number, since 2×1391449289² = 3872262247717211042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1391449219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695724644 + 695724645.

It is an arithmetic number, because the mean of its divisors is an integer number (695724645).

Almost surely, 2^1391449289 is an apocalyptic number.

It is an amenable number.

1391449289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391449289 is an equidigital number, since it uses as much as digits as its factorization.

1391449289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 1391449289 is about 37302.1351801743. The cubic root of 1391449289 is about 1116.4067690787.

The spelling of 1391449289 in words is "one billion, three hundred ninety-one million, four hundred forty-nine thousand, two hundred eighty-nine".