1003691 has 6 divisors (see below), whose sum is σ = 1087020. Its totient is φ = 926328.

The previous prime is 1003679. The next prime is 1003693. The reversal of 1003691 is 1963001.

It is not a de Polignac number, because 1003691 - 2⁶ = 1003627 is a prime.

It is a super-3 number, since 3×1003691³ = 3033341762181805113, which contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1003693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2801 + ... + 3138.

It is an arithmetic number, because the mean of its divisors is an integer number (181170).

2^1003691 is an apocalyptic number.

1003691 is a deficient number, since it is larger than the sum of its proper divisors (83329).

1003691 is an equidigital number, since it uses as much as digits as its factorization.

1003691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5965 (or 5952 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 1003691 is about 1001.8438002004. The cubic root of 1003691 is about 100.1228822710.

Adding to 1003691 its reverse (1963001), we get a palindrome (2966692).

It can be divided in two parts, 10036 and 91, that multiplied together give a triangular number (913276 = T₁₃₅₁).

The spelling of 1003691 in words is "one million, three thousand, six hundred ninety-one".