1278910229 has 2 divisors, whose sum is σ = 1278910230. Its totient is φ = 1278910228.

The previous prime is 1278910103. The next prime is 1278910247. The reversal of 1278910229 is 9220198721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246443025 + 32467204 = 35305^2 + 5698^2 .

It is an emirp because it is prime and its reverse (9220198721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278910229 - 2²⁰ = 1277861653 is a prime.

It is a super-2 number, since 2×1278910229² = 3271222747681664882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278910249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639455114 + 639455115.

It is an arithmetic number, because the mean of its divisors is an integer number (639455115).

Almost surely, 2^1278910229 is an apocalyptic number.

It is an amenable number.

1278910229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278910229 is an equidigital number, since it uses as much as digits as its factorization.

1278910229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 1278910229 is about 35761.8543842458. The cubic root of 1278910229 is about 1085.4588243996.

The spelling of 1278910229 in words is "one billion, two hundred seventy-eight million, nine hundred ten thousand, two hundred twenty-nine".