1242145493 has 2 divisors, whose sum is σ = 1242145494. Its totient is φ = 1242145492.

The previous prime is 1242145483. The next prime is 1242145517. The reversal of 1242145493 is 3945412421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1228292209 + 13853284 = 35047^2 + 3722^2 .

It is an emirp because it is prime and its reverse (3945412421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242145493 - 2¹⁰ = 1242144469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242145423) 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, 621072746 + 621072747.

It is an arithmetic number, because the mean of its divisors is an integer number (621072747).

Almost surely, 2^1242145493 is an apocalyptic number.

It is an amenable number.

1242145493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242145493 is an equidigital number, since it uses as much as digits as its factorization.

1242145493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 35.

The square root of 1242145493 is about 35244.0845107374. The cubic root of 1242145493 is about 1074.9563329657.

The spelling of 1242145493 in words is "one billion, two hundred forty-two million, one hundred forty-five thousand, four hundred ninety-three".