1244842537 has 2 divisors, whose sum is σ = 1244842538. Its totient is φ = 1244842536.

The previous prime is 1244842531. The next prime is 1244842553. The reversal of 1244842537 is 7352484421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1127683561 + 117158976 = 33581^2 + 10824^2 .

It is an emirp because it is prime and its reverse (7352484421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1244842537 - 2¹¹ = 1244840489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1244842537.

It is not a weakly prime, because it can be changed into another prime (1244842531) 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, 622421268 + 622421269.

It is an arithmetic number, because the mean of its divisors is an integer number (622421269).

Almost surely, 2^1244842537 is an apocalyptic number.

It is an amenable number.

1244842537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244842537 is an equidigital number, since it uses as much as digits as its factorization.

1244842537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 40.

The square root of 1244842537 is about 35282.3261279638. The cubic root of 1244842537 is about 1075.7337804668.

The spelling of 1244842537 in words is "one billion, two hundred forty-four million, eight hundred forty-two thousand, five hundred thirty-seven".