1244721631 has 2 divisors, whose sum is σ = 1244721632. Its totient is φ = 1244721630.

The previous prime is 1244721619. The next prime is 1244721671. The reversal of 1244721631 is 1361274421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1244721631 - 2⁹ = 1244721119 is a prime.

It is a super-2 number, since 2×1244721631² = 3098663877358600322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1244721593 and 1244721602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1244721671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622360815 + 622360816.

It is an arithmetic number, because the mean of its divisors is an integer number (622360816).

Almost surely, 2^1244721631 is an apocalyptic number.

1244721631 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244721631 is an equidigital number, since it uses as much as digits as its factorization.

1244721631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 1244721631 is about 35280.6126789204. The cubic root of 1244721631 is about 1075.6989522655.

The spelling of 1244721631 in words is "one billion, two hundred forty-four million, seven hundred twenty-one thousand, six hundred thirty-one".