1557139589 has 2 divisors, whose sum is σ = 1557139590. Its totient is φ = 1557139588.

The previous prime is 1557139501. The next prime is 1557139603. The reversal of 1557139589 is 9859317551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1416242689 + 140896900 = 37633^2 + 11870^2 .

It is an emirp because it is prime and its reverse (9859317551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1557139589 - 2⁸ = 1557139333 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1557139589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1557139189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 778569794 + 778569795.

It is an arithmetic number, because the mean of its divisors is an integer number (778569795).

Almost surely, 2^1557139589 is an apocalyptic number.

It is an amenable number.

1557139589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1557139589 is an equidigital number, since it uses as much as digits as its factorization.

1557139589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701000, while the sum is 53.

The square root of 1557139589 is about 39460.6080667797. The cubic root of 1557139589 is about 1159.0687107622.

The spelling of 1557139589 in words is "one billion, five hundred fifty-seven million, one hundred thirty-nine thousand, five hundred eighty-nine".