1279265551 has 2 divisors, whose sum is σ = 1279265552. Its totient is φ = 1279265550.

The previous prime is 1279265513. The next prime is 1279265557. The reversal of 1279265551 is 1555629721.

It is a strong prime.

It is an emirp because it is prime and its reverse (1555629721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279265551 - 2⁷ = 1279265423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279265498 and 1279265507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279265557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639632775 + 639632776.

It is an arithmetic number, because the mean of its divisors is an integer number (639632776).

Almost surely, 2^1279265551 is an apocalyptic number.

1279265551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279265551 is an equidigital number, since it uses as much as digits as its factorization.

1279265551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The square root of 1279265551 is about 35766.8219303868. The cubic root of 1279265551 is about 1085.5593401039.

The spelling of 1279265551 in words is "one billion, two hundred seventy-nine million, two hundred sixty-five thousand, five hundred fifty-one".