1278548441 has 2 divisors, whose sum is σ = 1278548442. Its totient is φ = 1278548440.

The previous prime is 1278548389. The next prime is 1278548459. The reversal of 1278548441 is 1448458721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1203812416 + 74736025 = 34696^2 + 8645^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278548441 - 2¹⁸ = 1278286297 is a prime.

It is a super-2 number, since 2×1278548441² = 3269372231967060962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1278548392 and 1278548401.

It is not a weakly prime, because it can be changed into another prime (1278548941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639274220 + 639274221.

It is an arithmetic number, because the mean of its divisors is an integer number (639274221).

Almost surely, 2^1278548441 is an apocalyptic number.

It is an amenable number.

1278548441 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278548441 is an equidigital number, since it uses as much as digits as its factorization.

1278548441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 286720, while the sum is 44.

The square root of 1278548441 is about 35756.7957317207. The cubic root of 1278548441 is about 1085.3564604221.

The spelling of 1278548441 in words is "one billion, two hundred seventy-eight million, five hundred forty-eight thousand, four hundred forty-one".