1277308213 has 2 divisors, whose sum is σ = 1277308214. Its totient is φ = 1277308212.

The previous prime is 1277308183. The next prime is 1277308259. The reversal of 1277308213 is 3128037721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1195983889 + 81324324 = 34583^2 + 9018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277308213 - 2¹⁷ = 1277177141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1277308273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638654106 + 638654107.

It is an arithmetic number, because the mean of its divisors is an integer number (638654107).

Almost surely, 2^1277308213 is an apocalyptic number.

It is an amenable number.

1277308213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277308213 is an equidigital number, since it uses as much as digits as its factorization.

1277308213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1277308213 is about 35739.4489744876. The cubic root of 1277308213 is about 1085.0054047739.

The spelling of 1277308213 in words is "one billion, two hundred seventy-seven million, three hundred eight thousand, two hundred thirteen".