1288624081 has 4 divisors (see below), whose sum is σ = 1288696500. Its totient is φ = 1288551664.

The previous prime is 1288624067. The next prime is 1288624097. The reversal of 1288624081 is 1804268821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 596092225 + 692531856 = 24415^2 + 26316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288624081 - 2¹¹ = 1288622033 is a prime.

It is a super-2 number, since 2×1288624081² = 3321104044266189122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1288624031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10995 + ... + 51943.

It is an arithmetic number, because the mean of its divisors is an integer number (322174125).

Almost surely, 2^1288624081 is an apocalyptic number.

It is an amenable number.

1288624081 is a deficient number, since it is larger than the sum of its proper divisors (72419).

1288624081 is an equidigital number, since it uses as much as digits as its factorization.

1288624081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72418.

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 1288624081 is about 35897.4105054947. The cubic root of 1288624081 is about 1088.2000653144.

The spelling of 1288624081 in words is "one billion, two hundred eighty-eight million, six hundred twenty-four thousand, eighty-one".