1213003 has 4 divisors (see below), whose sum is σ = 1323288. Its totient is φ = 1102720.

The previous prime is 1212989. The next prime is 1213007. The reversal of 1213003 is 3003121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213003 is a prime.

It is a Duffinian number.

1213003 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1213007) 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, 55126 + ... + 55147.

It is an arithmetic number, because the mean of its divisors is an integer number (330822).

2^1213003 is an apocalyptic number.

1213003 is a deficient number, since it is larger than the sum of its proper divisors (110285).

1213003 is a wasteful number, since it uses less digits than its factorization.

1213003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110284.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1213003 is about 1101.3641541289. The cubic root of 1213003 is about 106.6483052162.

Adding to 1213003 its reverse (3003121), we get a palindrome (4216124).

It can be divided in two parts, 121 and 3003, that multiplied together give a palindrome (363363).

The spelling of 1213003 in words is "one million, two hundred thirteen thousand, three".