1238145589 has 2 divisors, whose sum is σ = 1238145590. Its totient is φ = 1238145588.

The previous prime is 1238145553. The next prime is 1238145607. The reversal of 1238145589 is 9855418321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893412100 + 344733489 = 29890^2 + 18567^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238145589 - 2¹⁷ = 1238014517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238145509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619072794 + 619072795.

It is an arithmetic number, because the mean of its divisors is an integer number (619072795).

Almost surely, 2^1238145589 is an apocalyptic number.

It is an amenable number.

1238145589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238145589 is an equidigital number, since it uses as much as digits as its factorization.

1238145589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 46.

The square root of 1238145589 is about 35187.2930047198. The cubic root of 1238145589 is about 1073.8012493637.

It can be divided in two parts, 12381 and 45589, that added together give a triangular number (57970 = T₃₄₀).

The spelling of 1238145589 in words is "one billion, two hundred thirty-eight million, one hundred forty-five thousand, five hundred eighty-nine".