1121305403 has 4 divisors (see below), whose sum is σ = 1122668688. Its totient is φ = 1119942120.

The previous prime is 1121305399. The next prime is 1121305411. The reversal of 1121305403 is 3045031211.

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 1121305403 - 2² = 1121305399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121305303) 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, 680408 + ... + 682053.

It is an arithmetic number, because the mean of its divisors is an integer number (280667172).

Almost surely, 2^1121305403 is an apocalyptic number.

1121305403 is a deficient number, since it is larger than the sum of its proper divisors (1363285).

1121305403 is an equidigital number, since it uses as much as digits as its factorization.

1121305403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363284.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1121305403 is about 33485.8985693978. The cubic root of 1121305403 is about 1038.9021338004.

Adding to 1121305403 its reverse (3045031211), we get a palindrome (4166336614).

The spelling of 1121305403 in words is "one billion, one hundred twenty-one million, three hundred five thousand, four hundred three".