1243375897 has 2 divisors, whose sum is σ = 1243375898. Its totient is φ = 1243375896.

The previous prime is 1243375891. The next prime is 1243375907. The reversal of 1243375897 is 7985733421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1134611856 + 108764041 = 33684^2 + 10429^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243375897 - 2¹⁹ = 1242851609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243375897.

It is not a weakly prime, because it can be changed into another prime (1243375891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621687948 + 621687949.

It is an arithmetic number, because the mean of its divisors is an integer number (621687949).

Almost surely, 2^1243375897 is an apocalyptic number.

It is an amenable number.

1243375897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243375897 is an equidigital number, since it uses as much as digits as its factorization.

1243375897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 1243375897 is about 35261.5356585614. The cubic root of 1243375897 is about 1075.3111475748.

The spelling of 1243375897 in words is "one billion, two hundred forty-three million, three hundred seventy-five thousand, eight hundred ninety-seven".