1123420247 has 2 divisors, whose sum is σ = 1123420248. Its totient is φ = 1123420246.

The previous prime is 1123420229. The next prime is 1123420261. The reversal of 1123420247 is 7420243211.

It is a strong prime.

It is an emirp because it is prime and its reverse (7420243211) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123420247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123420267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561710123 + 561710124.

It is an arithmetic number, because the mean of its divisors is an integer number (561710124).

Almost surely, 2^1123420247 is an apocalyptic number.

1123420247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123420247 is an equidigital number, since it uses as much as digits as its factorization.

1123420247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 1123420247 is about 33517.4618221607. The cubic root of 1123420247 is about 1039.5548659017.

Adding to 1123420247 its reverse (7420243211), we get a palindrome (8543663458).

The spelling of 1123420247 in words is "one billion, one hundred twenty-three million, four hundred twenty thousand, two hundred forty-seven".