1279772551 has 2 divisors, whose sum is σ = 1279772552. Its totient is φ = 1279772550.

The previous prime is 1279772519. The next prime is 1279772567. The reversal of 1279772551 is 1552779721.

It is a strong prime.

It is an emirp because it is prime and its reverse (1552779721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279772551 - 2⁵ = 1279772519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279772951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639886275 + 639886276.

It is an arithmetic number, because the mean of its divisors is an integer number (639886276).

Almost surely, 2^1279772551 is an apocalyptic number.

1279772551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279772551 is an equidigital number, since it uses as much as digits as its factorization.

1279772551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 308700, while the sum is 46.

The square root of 1279772551 is about 35773.9088023660. The cubic root of 1279772551 is about 1085.7027312062.

The spelling of 1279772551 in words is "one billion, two hundred seventy-nine million, seven hundred seventy-two thousand, five hundred fifty-one".