1244689769 has 2 divisors, whose sum is σ = 1244689770. Its totient is φ = 1244689768.

The previous prime is 1244689723. The next prime is 1244689907. The reversal of 1244689769 is 9679864421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1222411369 + 22278400 = 34963^2 + 4720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1244689769 is a prime.

It is a super-2 number, since 2×1244689769² = 3098505242106546722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1244689709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622344884 + 622344885.

It is an arithmetic number, because the mean of its divisors is an integer number (622344885).

Almost surely, 2^1244689769 is an apocalyptic number.

It is an amenable number.

1244689769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244689769 is an equidigital number, since it uses as much as digits as its factorization.

1244689769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 56.

The square root of 1244689769 is about 35280.1611249155. The cubic root of 1244689769 is about 1075.6897737173.

The spelling of 1244689769 in words is "one billion, two hundred forty-four million, six hundred eighty-nine thousand, seven hundred sixty-nine".