1288985811 has 16 divisors (see below), whose sum is σ = 1758771360. Its totient is φ = 839404800.

The previous prime is 1288985809. The next prime is 1288985833. The reversal of 1288985811 is 1185898821.

It is not a de Polignac number, because 1288985811 - 2¹ = 1288985809 is a prime.

It is a super-2 number, since 2×1288985811² = 3322968841918655442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1288985801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18711 + ... + 54111.

It is an arithmetic number, because the mean of its divisors is an integer number (109923210).

Almost surely, 2^1288985811 is an apocalyptic number.

1288985811 is a deficient number, since it is larger than the sum of its proper divisors (469785549).

1288985811 is a wasteful number, since it uses less digits than its factorization.

1288985811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35686.

The product of its digits is 368640, while the sum is 51.

The square root of 1288985811 is about 35902.4485376694. The cubic root of 1288985811 is about 1088.3018787625.

The spelling of 1288985811 in words is "one billion, two hundred eighty-eight million, nine hundred eighty-five thousand, eight hundred eleven".