1278251042 has 4 divisors (see below), whose sum is σ = 1917376566. Its totient is φ = 639125520.

The previous prime is 1278251041. The next prime is 1278251069. The reversal of 1278251042 is 2401528721.

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

It can be written as a sum of positive squares in only one way, i.e., 1134275041 + 143976001 = 33679^2 + 11999^2 .

It is not an unprimeable number, because it can be changed into a prime (1278251041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319562759 + ... + 319562762.

Almost surely, 2^1278251042 is an apocalyptic number.

1278251042 is a deficient number, since it is larger than the sum of its proper divisors (639125524).

1278251042 is an equidigital number, since it uses as much as digits as its factorization.

1278251042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639125523.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 1278251042 is about 35752.6368538042. The cubic root of 1278251042 is about 1085.2723001494.

Adding to 1278251042 its reverse (2401528721), we get a palindrome (3679779763).

The spelling of 1278251042 in words is "one billion, two hundred seventy-eight million, two hundred fifty-one thousand, forty-two".