1243348157 has 2 divisors, whose sum is σ = 1243348158. Its totient is φ = 1243348156.

The previous prime is 1243348151. The next prime is 1243348207. The reversal of 1243348157 is 7518433421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 708304996 + 535043161 = 26614^2 + 23131^2 .

It is an emirp because it is prime and its reverse (7518433421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243348157 - 2¹² = 1243344061 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243348157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243348151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621674078 + 621674079.

It is an arithmetic number, because the mean of its divisors is an integer number (621674079).

Almost surely, 2^1243348157 is an apocalyptic number.

It is an amenable number.

1243348157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243348157 is an equidigital number, since it uses as much as digits as its factorization.

1243348157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 38.

The square root of 1243348157 is about 35261.1423099139. The cubic root of 1243348157 is about 1075.3031507030.

The spelling of 1243348157 in words is "one billion, two hundred forty-three million, three hundred forty-eight thousand, one hundred fifty-seven".