1279203217 has 2 divisors, whose sum is σ = 1279203218. Its totient is φ = 1279203216.

The previous prime is 1279203203. The next prime is 1279203223. The reversal of 1279203217 is 7123029721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187215936 + 91987281 = 34456^2 + 9591^2 .

It is an emirp because it is prime and its reverse (7123029721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279203217 - 2²⁷ = 1144985489 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279233217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639601608 + 639601609.

It is an arithmetic number, because the mean of its divisors is an integer number (639601609).

Almost surely, 2^1279203217 is an apocalyptic number.

It is an amenable number.

1279203217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279203217 is an equidigital number, since it uses as much as digits as its factorization.

1279203217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 1279203217 is about 35765.9505256047. The cubic root of 1279203217 is about 1085.5417080193.

The spelling of 1279203217 in words is "one billion, two hundred seventy-nine million, two hundred three thousand, two hundred seventeen".