1288821169 has 12 divisors (see below), whose sum is σ = 1374133824. Its totient is φ = 1206508424.

The previous prime is 1288821137. The next prime is 1288821199. The reversal of 1288821169 is 9611288821.

It is a happy number.

It is not a de Polignac number, because 1288821169 - 2⁵ = 1288821137 is a prime.

It is a super-2 number, since 2×1288821169² = 3322120011325053122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288821199) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38124 + ... + 63490.

It is an arithmetic number, because the mean of its divisors is an integer number (114511152).

Almost surely, 2^1288821169 is an apocalyptic number.

It is an amenable number.

1288821169 is a deficient number, since it is larger than the sum of its proper divisors (85312655).

1288821169 is an equidigital number, since it uses as much as digits as its factorization.

1288821169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25484 (or 25437 counting only the distinct ones).

The product of its digits is 110592, while the sum is 46.

The square root of 1288821169 is about 35900.1555567660. The cubic root of 1288821169 is about 1088.2555405676.

The spelling of 1288821169 in words is "one billion, two hundred eighty-eight million, eight hundred twenty-one thousand, one hundred sixty-nine".