1231345403 has 4 divisors (see below), whose sum is σ = 1248688368. Its totient is φ = 1214002440.

The previous prime is 1231345361. The next prime is 1231345469. The reversal of 1231345403 is 3045431321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3045431321 = 19 ⋅160285859.

It is a cyclic number.

It is not a de Polignac number, because 1231345403 - 2⁸ = 1231345147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231345303) 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, 8671376 + ... + 8671517.

It is an arithmetic number, because the mean of its divisors is an integer number (312172092).

Almost surely, 2^1231345403 is an apocalyptic number.

1231345403 is a deficient number, since it is larger than the sum of its proper divisors (17342965).

1231345403 is an equidigital number, since it uses as much as digits as its factorization.

1231345403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17342964.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 1231345403 is about 35090.5315291746. The cubic root of 1231345403 is about 1071.8317832485.

Adding to 1231345403 its reverse (3045431321), we get a palindrome (4276776724).

The spelling of 1231345403 in words is "one billion, two hundred thirty-one million, three hundred forty-five thousand, four hundred three".