1244506639 has 2 divisors, whose sum is σ = 1244506640. Its totient is φ = 1244506638.

The previous prime is 1244506603. The next prime is 1244506651. The reversal of 1244506639 is 9366054421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1244506639 - 2⁷ = 1244506511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244506139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622253319 + 622253320.

It is an arithmetic number, because the mean of its divisors is an integer number (622253320).

Almost surely, 2^1244506639 is an apocalyptic number.

1244506639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244506639 is an equidigital number, since it uses as much as digits as its factorization.

1244506639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 1244506639 is about 35277.5656614795. The cubic root of 1244506639 is about 1075.6370160650.

The spelling of 1244506639 in words is "one billion, two hundred forty-four million, five hundred six thousand, six hundred thirty-nine".