1263213278 has 4 divisors (see below), whose sum is σ = 1894819920. Its totient is φ = 631606638.

The previous prime is 1263213277. The next prime is 1263213283. The reversal of 1263213278 is 8723123621.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263213277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315803318 + ... + 315803321.

It is an arithmetic number, because the mean of its divisors is an integer number (473704980).

Almost surely, 2^1263213278 is an apocalyptic number.

1263213278 is a deficient number, since it is larger than the sum of its proper divisors (631606642).

1263213278 is an equidigital number, since it uses as much as digits as its factorization.

1263213278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631606641.

The product of its digits is 24192, while the sum is 35.

The square root of 1263213278 is about 35541.7118045825. The cubic root of 1263213278 is about 1080.9996682528. Note that the first 3 decimals are identical.

Adding to 1263213278 its reverse (8723123621), we get a palindrome (9986336899).

The spelling of 1263213278 in words is "one billion, two hundred sixty-three million, two hundred thirteen thousand, two hundred seventy-eight".