1278123325 has 12 divisors (see below), whose sum is σ = 1678101300. Its totient is φ = 962351360.

The previous prime is 1278123323. The next prime is 1278123349. The reversal of 1278123325 is 5233218721.

It can be written as a sum of positive squares in 6 ways, for example, as 11546404 + 1266576921 = 3398^2 + 35589^2 .

It is not a de Polignac number, because 1278123325 - 2¹ = 1278123323 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278123323) 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 in 11 ways as a sum of consecutive naturals, for example, 1503250 + ... + 1504099.

It is an arithmetic number, because the mean of its divisors is an integer number (139841775).

Almost surely, 2^1278123325 is an apocalyptic number.

It is an amenable number.

1278123325 is a deficient number, since it is larger than the sum of its proper divisors (399977975).

1278123325 is a wasteful number, since it uses less digits than its factorization.

1278123325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007376 (or 3007371 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 1278123325 is about 35750.8506891794. The cubic root of 1278123325 is about 1085.2361537967.

The spelling of 1278123325 in words is "one billion, two hundred seventy-eight million, one hundred twenty-three thousand, three hundred twenty-five".