1005631 has 6 divisors (see below), whose sum is σ = 1105496. Its totient is φ = 914100.

The previous prime is 1005619. The next prime is 1005637. The reversal of 1005631 is 1365001.

It is not a de Polignac number, because 1005631 - 2⁷ = 1005503 is a prime.

It is a super-2 number, since 2×1005631² = 2022587416322, 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 (1005637) 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 5 ways as a sum of consecutive naturals, for example, 4035 + ... + 4276.

2^1005631 is an apocalyptic number.

1005631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1005631 is a deficient number, since it is larger than the sum of its proper divisors (99865).

1005631 is an equidigital number, since it uses as much as digits as its factorization.

1005631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333 (or 8322 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 1005631 is about 1002.8115476000. The cubic root of 1005631 is about 100.1873487851.

The spelling of 1005631 in words is "one million, five thousand, six hundred thirty-one".