1288631 has 4 divisors (see below), whose sum is σ = 1303200. Its totient is φ = 1274064.

The previous prime is 1288613. The next prime is 1288643. The reversal of 1288631 is 1368821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1368821 = 271 ⋅5051.

It is a cyclic number.

It is not a de Polignac number, because 1288631 - 2¹⁰ = 1287607 is a prime.

It is a super-2 number, since 2×1288631² = 3321139708322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1288594 and 1288603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7151 + ... + 7328.

It is an arithmetic number, because the mean of its divisors is an integer number (325800).

2^1288631 is an apocalyptic number.

1288631 is a deficient number, since it is larger than the sum of its proper divisors (14569).

1288631 is an equidigital number, since it uses as much as digits as its factorization.

1288631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14568.

The product of its digits is 2304, while the sum is 29.

The square root of 1288631 is about 1135.1788405357. The cubic root of 1288631 is about 108.8202012933.

The spelling of 1288631 in words is "one million, two hundred eighty-eight thousand, six hundred thirty-one".