1489972391 has 2 divisors, whose sum is σ = 1489972392. Its totient is φ = 1489972390.

The previous prime is 1489972369. The next prime is 1489972399. The reversal of 1489972391 is 1932799841.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1489972391 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1489972399) 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, 744986195 + 744986196.

It is an arithmetic number, because the mean of its divisors is an integer number (744986196).

Almost surely, 2^1489972391 is an apocalyptic number.

1489972391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1489972391 is an equidigital number, since it uses as much as digits as its factorization.

1489972391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 1489972391 is about 38600.1605048476. The cubic root of 1489972391 is about 1142.1577045497.

The spelling of 1489972391 in words is "one billion, four hundred eighty-nine million, nine hundred seventy-two thousand, three hundred ninety-one".