1288031887 has 4 divisors (see below), whose sum is σ = 1289309440. Its totient is φ = 1286754336.

The previous prime is 1288031821. The next prime is 1288031939. The reversal of 1288031887 is 7881308821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1288031887 - 2²³ = 1279643279 is a prime.

It is a super-2 number, since 2×1288031887² = 3318052283857561538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288031807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637263 + ... + 639280.

It is an arithmetic number, because the mean of its divisors is an integer number (322327360).

Almost surely, 2^1288031887 is an apocalyptic number.

1288031887 is a deficient number, since it is larger than the sum of its proper divisors (1277553).

1288031887 is a wasteful number, since it uses less digits than its factorization.

1288031887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277552.

The product of its (nonzero) digits is 172032, while the sum is 46.

The square root of 1288031887 is about 35889.1611353623. The cubic root of 1288031887 is about 1088.0333437441.

The spelling of 1288031887 in words is "one billion, two hundred eighty-eight million, thirty-one thousand, eight hundred eighty-seven".