1121257403 has 4 divisors (see below), whose sum is σ = 1281437040. Its totient is φ = 961077768.

The previous prime is 1121257399. The next prime is 1121257433. The reversal of 1121257403 is 3047521211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3047521211 = 7 ⋅435360173.

It is not a de Polignac number, because 1121257403 - 2² = 1121257399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121257433) 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, 80089808 + ... + 80089821.

It is an arithmetic number, because the mean of its divisors is an integer number (320359260).

Almost surely, 2^1121257403 is an apocalyptic number.

1121257403 is a deficient number, since it is larger than the sum of its proper divisors (160179637).

1121257403 is an equidigital number, since it uses as much as digits as its factorization.

1121257403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160179636.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1121257403 is about 33485.1818421223. The cubic root of 1121257403 is about 1038.8873094079.

Adding to 1121257403 its reverse (3047521211), we get a palindrome (4168778614).

The spelling of 1121257403 in words is "one billion, one hundred twenty-one million, two hundred fifty-seven thousand, four hundred three".