1123345257 has 4 divisors (see below), whose sum is σ = 1497793680. Its totient is φ = 748896836.

The previous prime is 1123345241. The next prime is 1123345259. The reversal of 1123345257 is 7525433211.

1123345257 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1123345257 - 2⁴ = 1123345241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1123345259) 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, 187224207 + ... + 187224212.

It is an arithmetic number, because the mean of its divisors is an integer number (374448420).

Almost surely, 2^1123345257 is an apocalyptic number.

It is an amenable number.

1123345257 is a deficient number, since it is larger than the sum of its proper divisors (374448423).

1123345257 is an equidigital number, since it uses as much as digits as its factorization.

1123345257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374448422.

The product of its digits is 25200, while the sum is 33.

The square root of 1123345257 is about 33516.3431328658. The cubic root of 1123345257 is about 1039.5317347673.

Adding to 1123345257 its reverse (7525433211), we get a palindrome (8648778468).

The spelling of 1123345257 in words is "one billion, one hundred twenty-three million, three hundred forty-five thousand, two hundred fifty-seven".