1272618265 has 8 divisors (see below), whose sum is σ = 1533812040. Its totient is φ = 1013647872.

The previous prime is 1272618241. The next prime is 1272618289. The reversal of 1272618265 is 5628162721.

It is an interprime number because it is at equal distance from previous prime (1272618241) and next prime (1272618289).

It can be written as a sum of positive squares in 4 ways, for example, as 96196864 + 1176421401 = 9808^2 + 34299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1272618265 - 2¹¹ = 1272616217 is a prime.

It is a super-2 number, since 2×1272618265² = 3239114496823220450, which contains 22 as substring.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 554584 + ... + 556873.

It is an arithmetic number, because the mean of its divisors is an integer number (191726505).

Almost surely, 2^1272618265 is an apocalyptic number.

It is an amenable number.

1272618265 is a deficient number, since it is larger than the sum of its proper divisors (261193775).

1272618265 is a wasteful number, since it uses less digits than its factorization.

1272618265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111691.

The product of its digits is 80640, while the sum is 40.

The square root of 1272618265 is about 35673.7755921629. The cubic root of 1272618265 is about 1083.6758223374.

The spelling of 1272618265 in words is "one billion, two hundred seventy-two million, six hundred eighteen thousand, two hundred sixty-five".