1123340261 has 4 divisors (see below), whose sum is σ = 1123492800. Its totient is φ = 1123187724.

The previous prime is 1123340237. The next prime is 1123340303. The reversal of 1123340261 is 1620433211.

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 an emirpimes, since its reverse is a distinct semiprime: 1620433211 = 193 ⋅8396027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123340261 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 (1123340221) 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, 64631 + ... + 80148.

It is an arithmetic number, because the mean of its divisors is an integer number (280873200).

Almost surely, 2^1123340261 is an apocalyptic number.

It is an amenable number.

1123340261 is a deficient number, since it is larger than the sum of its proper divisors (152539).

1123340261 is an equidigital number, since it uses as much as digits as its factorization.

1123340261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152538.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1123340261 is about 33516.2686019790. The cubic root of 1123340261 is about 1039.5301936833.

Adding to 1123340261 its reverse (1620433211), we get a palindrome (2743773472).

The spelling of 1123340261 in words is "one billion, one hundred twenty-three million, three hundred forty thousand, two hundred sixty-one".