1278634579 has 2 divisors, whose sum is σ = 1278634580. Its totient is φ = 1278634578.

The previous prime is 1278634559. The next prime is 1278634601. The reversal of 1278634579 is 9754368721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1278634579 - 2⁵ = 1278634547 is a prime.

It is a super-2 number, since 2×1278634579² = 3269812773229014482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1278634519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639317289 + 639317290.

It is an arithmetic number, because the mean of its divisors is an integer number (639317290).

Almost surely, 2^1278634579 is an apocalyptic number.

1278634579 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278634579 is an equidigital number, since it uses as much as digits as its factorization.

1278634579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 52.

The square root of 1278634579 is about 35758.0002097433. Note that the first 3 decimals coincide. The cubic root of 1278634579 is about 1085.3808339831.

The spelling of 1278634579 in words is "one billion, two hundred seventy-eight million, six hundred thirty-four thousand, five hundred seventy-nine".