144639637 has 2 divisors, whose sum is σ = 144639638. Its totient is φ = 144639636.

The previous prime is 144639631. The next prime is 144639653. The reversal of 144639637 is 736936441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140801956 + 3837681 = 11866^2 + 1959^2 .

It is an emirp because it is prime and its reverse (736936441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144639637 - 2³ = 144639629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 144639593 and 144639602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144639631) 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, 72319818 + 72319819.

It is an arithmetic number, because the mean of its divisors is an integer number (72319819).

Almost surely, 2^144639637 is an apocalyptic number.

It is an amenable number.

144639637 is a deficient number, since it is larger than the sum of its proper divisors (1).

144639637 is an equidigital number, since it uses as much as digits as its factorization.

144639637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 43.

The square root of 144639637 is about 12026.6220111883. The cubic root of 144639637 is about 524.9232081181.

The spelling of 144639637 in words is "one hundred forty-four million, six hundred thirty-nine thousand, six hundred thirty-seven".