1275972769 has 6 divisors (see below), whose sum is σ = 1321489910. Its totient is φ = 1231972896.

The previous prime is 1275972751. The next prime is 1275972809. The reversal of 1275972769 is 9672795721.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 246333025 + 1029639744 = 15695^2 + 32088^2 .

It is not a de Polignac number, because 1275972769 - 2¹¹ = 1275970721 is a prime.

It is a super-2 number, since 2×1275972769² = 3256213014459054722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275972469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 757764 + ... + 759445.

Almost surely, 2^1275972769 is an apocalyptic number.

It is an amenable number.

1275972769 is a deficient number, since it is larger than the sum of its proper divisors (45517141).

1275972769 is an equidigital number, since it uses as much as digits as its factorization.

1275972769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517267 (or 1517238 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 55.

The square root of 1275972769 is about 35720.7610361258. The cubic root of 1275972769 is about 1084.6271433626.

The spelling of 1275972769 in words is "one billion, two hundred seventy-five million, nine hundred seventy-two thousand, seven hundred sixty-nine".