1001631 has 12 divisors (see below), whose sum is σ = 1386632. Its totient is φ = 643104.

The previous prime is 1001629. The next prime is 1001639. The reversal of 1001631 is 1361001.

It is not a de Polignac number, because 1001631 - 2¹ = 1001629 is a prime.

It is a super-2 number, since 2×1001631² = 2006529320322, 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 (1001639) 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, 2325 + ... + 2721.

2^1001631 is an apocalyptic number.

1001631 is a deficient number, since it is larger than the sum of its proper divisors (385001).

1001631 is an equidigital number, since it uses as much as digits as its factorization.

1001631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1001631 is about 1000.8151677508. The cubic root of 1001631 is about 100.0543371361.

Adding to 1001631 its reverse (1361001), we get a palindrome (2362632).

The spelling of 1001631 in words is "one million, one thousand, six hundred thirty-one".