1285573889 has 2 divisors, whose sum is σ = 1285573890. Its totient is φ = 1285573888.

The previous prime is 1285573831. The next prime is 1285573903. The reversal of 1285573889 is 9883755821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1148871025 + 136702864 = 33895^2 + 11692^2 .

It is an emirp because it is prime and its reverse (9883755821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1285573889 - 2²⁴ = 1268796673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1285573189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642786944 + 642786945.

It is an arithmetic number, because the mean of its divisors is an integer number (642786945).

Almost surely, 2^1285573889 is an apocalyptic number.

It is an amenable number.

1285573889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285573889 is an equidigital number, since it uses as much as digits as its factorization.

1285573889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 56.

The square root of 1285573889 is about 35854.9004879389. The cubic root of 1285573889 is about 1087.3407918428.

The spelling of 1285573889 in words is "one billion, two hundred eighty-five million, five hundred seventy-three thousand, eight hundred eighty-nine".