1278113701 has 2 divisors, whose sum is σ = 1278113702. Its totient is φ = 1278113700.

The previous prime is 1278113699. The next prime is 1278113719. The reversal of 1278113701 is 1073118721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1272348900 + 5764801 = 35670^2 + 2401^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278113701 - 2¹ = 1278113699 is a prime.

It is a super-3 number, since 3×1278113701³ (a number of 28 digits) contains 333 as substring.

Together with 1278113699, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278113731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639056850 + 639056851.

It is an arithmetic number, because the mean of its divisors is an integer number (639056851).

Almost surely, 2^1278113701 is an apocalyptic number.

It is an amenable number.

1278113701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278113701 is an equidigital number, since it uses as much as digits as its factorization.

1278113701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 31.

The square root of 1278113701 is about 35750.7160907303. The cubic root of 1278113701 is about 1085.2334299232.

The spelling of 1278113701 in words is "one billion, two hundred seventy-eight million, one hundred thirteen thousand, seven hundred one".