1538120489 has 2 divisors, whose sum is σ = 1538120490. Its totient is φ = 1538120488.

The previous prime is 1538120477. The next prime is 1538120491. The reversal of 1538120489 is 9840218351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 793267225 + 744853264 = 28165^2 + 27292^2 .

It is a cyclic number.

It is not a de Polignac number, because 1538120489 - 2¹⁶ = 1538054953 is a prime.

Together with 1538120491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1538122489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769060244 + 769060245.

It is an arithmetic number, because the mean of its divisors is an integer number (769060245).

Almost surely, 2^1538120489 is an apocalyptic number.

It is an amenable number.

1538120489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538120489 is an equidigital number, since it uses as much as digits as its factorization.

1538120489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 1538120489 is about 39218.8792420181. The cubic root of 1538120489 is about 1154.3303625106.

The spelling of 1538120489 in words is "one billion, five hundred thirty-eight million, one hundred twenty thousand, four hundred eighty-nine".