1261003 has 4 divisors (see below), whose sum is σ = 1263600. Its totient is φ = 1258408.

The previous prime is 1260991. The next prime is 1261033. The reversal of 1261003 is 3001621.

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 1261003 - 2⁵ = 1260971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1261033) 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, 328 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (315900).

2^1261003 is an apocalyptic number.

1261003 is a deficient number, since it is larger than the sum of its proper divisors (2597).

1261003 is an equidigital number, since it uses as much as digits as its factorization.

1261003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1261003 is about 1122.9438988658. The cubic root of 1261003 is about 108.0368815509.

Adding to 1261003 its reverse (3001621), we get a palindrome (4262624).

The spelling of 1261003 in words is "one million, two hundred sixty-one thousand, three".