1243055117 has 2 divisors, whose sum is σ = 1243055118. Its totient is φ = 1243055116.

The previous prime is 1243055111. The next prime is 1243055119. The reversal of 1243055117 is 7115503421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1082804836 + 160250281 = 32906^2 + 12659^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243055117 - 2⁸ = 1243054861 is a prime.

Together with 1243055119, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243055117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243055111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621527558 + 621527559.

It is an arithmetic number, because the mean of its divisors is an integer number (621527559).

Almost surely, 2^1243055117 is an apocalyptic number.

It is an amenable number.

1243055117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243055117 is an equidigital number, since it uses as much as digits as its factorization.

1243055117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 1243055117 is about 35256.9867827641. The cubic root of 1243055117 is about 1075.2186660283.

Adding to 1243055117 its reverse (7115503421), we get a palindrome (8358558538).

The spelling of 1243055117 in words is "one billion, two hundred forty-three million, fifty-five thousand, one hundred seventeen".