1278342163 has 4 divisors (see below), whose sum is σ = 1460962480. Its totient is φ = 1095721848.

The previous prime is 1278342113. The next prime is 1278342223. The reversal of 1278342163 is 3612438721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1278342163 - 2¹⁷ = 1278211091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278342103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91310148 + ... + 91310161.

It is an arithmetic number, because the mean of its divisors is an integer number (365240620).

Almost surely, 2^1278342163 is an apocalyptic number.

1278342163 is a deficient number, since it is larger than the sum of its proper divisors (182620317).

1278342163 is an equidigital number, since it uses as much as digits as its factorization.

1278342163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182620316.

The product of its digits is 48384, while the sum is 37.

The square root of 1278342163 is about 35753.9111566833. The cubic root of 1278342163 is about 1085.2980876628.

It can be divided in two parts, 12783 and 42163, that added together give a triangular number (54946 = T₃₃₁).

The spelling of 1278342163 in words is "one billion, two hundred seventy-eight million, three hundred forty-two thousand, one hundred sixty-three".