1245315123 has 12 divisors (see below), whose sum is σ = 1937157040. Its totient is φ = 766347696.

The previous prime is 1245315121. The next prime is 1245315133. The reversal of 1245315123 is 3215135421.

1245315123 is a `hidden beast` number, since 1 + 2 + 4 + 531 + 5 + 123 = 666.

It is not a de Polignac number, because 1245315123 - 2¹ = 1245315121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1245315121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5321743 + ... + 5321976.

Almost surely, 2^1245315123 is an apocalyptic number.

1245315123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1245315123 is a deficient number, since it is larger than the sum of its proper divisors (691841917).

1245315123 is a wasteful number, since it uses less digits than its factorization.

1245315123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10643738 (or 10643735 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1245315123 is about 35289.0226982840. The cubic root of 1245315123 is about 1075.8698920339.

The spelling of 1245315123 in words is "one billion, two hundred forty-five million, three hundred fifteen thousand, one hundred twenty-three".