1123457261 has 4 divisors (see below), whose sum is σ = 1123528032. Its totient is φ = 1123386492.

The previous prime is 1123457227. The next prime is 1123457281. The reversal of 1123457261 is 1627543211.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1123457261 - 2³⁰ = 49715437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123457281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 680 + ... + 47406.

It is an arithmetic number, because the mean of its divisors is an integer number (280882008).

Almost surely, 2^1123457261 is an apocalyptic number.

It is an amenable number.

1123457261 is a deficient number, since it is larger than the sum of its proper divisors (70771).

1123457261 is an equidigital number, since it uses as much as digits as its factorization.

1123457261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70770.

The product of its digits is 10080, while the sum is 32.

The square root of 1123457261 is about 33518.0139775614. The cubic root of 1123457261 is about 1039.5662827220.

The spelling of 1123457261 in words is "one billion, one hundred twenty-three million, four hundred fifty-seven thousand, two hundred sixty-one".