1278675641 has 2 divisors, whose sum is σ = 1278675642. Its totient is φ = 1278675640.

The previous prime is 1278675613. The next prime is 1278675653. The reversal of 1278675641 is 1465768721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1094286400 + 184389241 = 33080^2 + 13579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278675641 - 2¹⁴ = 1278659257 is a prime.

It is a super-2 number, since 2×1278675641² = 3270022789773521762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1278675691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639337820 + 639337821.

It is an arithmetic number, because the mean of its divisors is an integer number (639337821).

Almost surely, 2^1278675641 is an apocalyptic number.

It is an amenable number.

1278675641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278675641 is an equidigital number, since it uses as much as digits as its factorization.

1278675641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 564480, while the sum is 47.

The square root of 1278675641 is about 35758.5743703521. The cubic root of 1278675641 is about 1085.3924524787.

It can be divided in two parts, 127 and 8675641, that added together give a palindrome (8675768).

The spelling of 1278675641 in words is "one billion, two hundred seventy-eight million, six hundred seventy-five thousand, six hundred forty-one".