1391672489 has 2 divisors, whose sum is σ = 1391672490. Its totient is φ = 1391672488.

The previous prime is 1391672473. The next prime is 1391672501. The reversal of 1391672489 is 9842761931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317109264 + 74563225 = 36292^2 + 8635^2 .

It is an emirp because it is prime and its reverse (9842761931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1391672489 - 2⁴ = 1391672473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391642489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695836244 + 695836245.

It is an arithmetic number, because the mean of its divisors is an integer number (695836245).

Almost surely, 2^1391672489 is an apocalyptic number.

It is an amenable number.

1391672489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391672489 is an equidigital number, since it uses as much as digits as its factorization.

1391672489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 50.

The square root of 1391672489 is about 37305.1268460516. The cubic root of 1391672489 is about 1116.4664595205.

The spelling of 1391672489 in words is "one billion, three hundred ninety-one million, six hundred seventy-two thousand, four hundred eighty-nine".