1278874273 has 2 divisors, whose sum is σ = 1278874274. Its totient is φ = 1278874272.

The previous prime is 1278874241. The next prime is 1278874297. The reversal of 1278874273 is 3724788721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220244624 + 58629649 = 34932^2 + 7657^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278874273 - 2⁵ = 1278874241 is a prime.

It is a super-2 number, since 2×1278874273² = 3271038812282557058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1278874573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639437136 + 639437137.

It is an arithmetic number, because the mean of its divisors is an integer number (639437137).

Almost surely, 2^1278874273 is an apocalyptic number.

It is an amenable number.

1278874273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278874273 is an equidigital number, since it uses as much as digits as its factorization.

1278874273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 49.

The square root of 1278874273 is about 35761.3516662891. The cubic root of 1278874273 is about 1085.4486519047.

The spelling of 1278874273 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-four thousand, two hundred seventy-three".