1000631 has 4 divisors (see below), whose sum is σ = 1003200. Its totient is φ = 998064.

The previous prime is 1000621. The next prime is 1000639. The reversal of 1000631 is 1360001.

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 1000631 - 2¹⁸ = 738487 is a prime.

It is a super-2 number, since 2×1000631² = 2002524796322, 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 (1000639) 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, 566 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (250800).

2^1000631 is an apocalyptic number.

1000631 is a deficient number, since it is larger than the sum of its proper divisors (2569).

1000631 is an equidigital number, since it uses as much as digits as its factorization.

1000631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2568.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1000631 is about 1000.3154502456. The cubic root of 1000631 is about 100.0210289109.

Adding to 1000631 its reverse (1360001), we get a palindrome (2360632).

The spelling of 1000631 in words is "one million, six hundred thirty-one", and thus it is an aban number.