1264943969 has 2 divisors, whose sum is σ = 1264943970. Its totient is φ = 1264943968.

The previous prime is 1264943963. The next prime is 1264943983. The reversal of 1264943969 is 9693494621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 668998225 + 595945744 = 25865^2 + 24412^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264943969 - 2²⁰ = 1263895393 is a prime.

It is a super-2 number, since 2×1264943969² = 3200166489418945922, 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 1264943969.

It is not a weakly prime, because it can be changed into another prime (1264943963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632471984 + 632471985.

It is an arithmetic number, because the mean of its divisors is an integer number (632471985).

Almost surely, 2^1264943969 is an apocalyptic number.

It is an amenable number.

1264943969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264943969 is an equidigital number, since it uses as much as digits as its factorization.

1264943969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 53.

The square root of 1264943969 is about 35566.0507928558. The cubic root of 1264943969 is about 1081.4931248128.

The spelling of 1264943969 in words is "one billion, two hundred sixty-four million, nine hundred forty-three thousand, nine hundred sixty-nine".