1272505669 has 2 divisors, whose sum is σ = 1272505670. Its totient is φ = 1272505668.

The previous prime is 1272505667. The next prime is 1272505691. The reversal of 1272505669 is 9665052721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1271849569 + 656100 = 35663^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 1272505669 - 2¹ = 1272505667 is a prime.

It is a super-2 number, since 2×1272505669² = 3238541355274275122, which contains 22 as substring.

Together with 1272505667, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272505667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636252834 + 636252835.

It is an arithmetic number, because the mean of its divisors is an integer number (636252835).

Almost surely, 2^1272505669 is an apocalyptic number.

It is an amenable number.

1272505669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272505669 is an equidigital number, since it uses as much as digits as its factorization.

1272505669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 1272505669 is about 35672.1974232034. The cubic root of 1272505669 is about 1083.6438616768.

The spelling of 1272505669 in words is "one billion, two hundred seventy-two million, five hundred five thousand, six hundred sixty-nine".