1264648769 has 2 divisors, whose sum is σ = 1264648770. Its totient is φ = 1264648768.

The previous prime is 1264648757. The next prime is 1264648799. The reversal of 1264648769 is 9678464621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 814360369 + 450288400 = 28537^2 + 21220^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264648769 is a prime.

It is a super-2 number, since 2×1264648769² = 3198673017866430722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1264648769.

It is not a weakly prime, because it can be changed into another prime (1264648709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632324384 + 632324385.

It is an arithmetic number, because the mean of its divisors is an integer number (632324385).

Almost surely, 2^1264648769 is an apocalyptic number.

It is an amenable number.

1264648769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264648769 is an equidigital number, since it uses as much as digits as its factorization.

1264648769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3483648, while the sum is 53.

The square root of 1264648769 is about 35561.9005257031. The cubic root of 1264648769 is about 1081.4089889099.

The spelling of 1264648769 in words is "one billion, two hundred sixty-four million, six hundred forty-eight thousand, seven hundred sixty-nine".