1288725539 has 2 divisors, whose sum is σ = 1288725540. Its totient is φ = 1288725538.

The previous prime is 1288725527. The next prime is 1288725553. The reversal of 1288725539 is 9355278821.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1288725539 - 2¹² = 1288721443 is a prime.

It is not a weakly prime, because it can be changed into another prime (1288725509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644362769 + 644362770.

It is an arithmetic number, because the mean of its divisors is an integer number (644362770).

Almost surely, 2^1288725539 is an apocalyptic number.

1288725539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288725539 is an equidigital number, since it uses as much as digits as its factorization.

1288725539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 50.

The square root of 1288725539 is about 35898.8236436795. The cubic root of 1288725539 is about 1088.2286238642.

The spelling of 1288725539 in words is "one billion, two hundred eighty-eight million, seven hundred twenty-five thousand, five hundred thirty-nine".