1285042505 has 16 divisors (see below), whose sum is σ = 1576828944. Its totient is φ = 1004989440.

The previous prime is 1285042489. The next prime is 1285042511. The reversal of 1285042505 is 5052405821.

It can be written as a sum of positive squares in 8 ways, for example, as 35844169 + 1249198336 = 5987^2 + 35344^2 .

It is not a de Polignac number, because 1285042505 - 2⁴ = 1285042489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65837 + ... + 83093.

It is an arithmetic number, because the mean of its divisors is an integer number (98551809).

Almost surely, 2^1285042505 is an apocalyptic number.

It is an amenable number.

1285042505 is a deficient number, since it is larger than the sum of its proper divisors (291786439).

1285042505 is a wasteful number, since it uses less digits than its factorization.

1285042505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17596.

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 1285042505 is about 35847.4895215830. The cubic root of 1285042505 is about 1087.1909560038.

It can be divided in two parts, 12850 and 42505, that added together give a palindrome (55355).

The spelling of 1285042505 in words is "one billion, two hundred eighty-five million, forty-two thousand, five hundred five".