1312123653 has 6 divisors (see below), whose sum is σ = 1895289734. Its totient is φ = 874749096.

The previous prime is 1312123649. The next prime is 1312123667. The reversal of 1312123653 is 3563212131.

1312123653 is a `hidden beast` number, since 1 + 3 + 1 + 2 + 1 + 2 + 3 + 653 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1286083044 + 26040609 = 35862^2 + 5103^2 .

It is not a de Polignac number, because 1312123653 - 2² = 1312123649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312123633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 72895750 + ... + 72895767.

Almost surely, 2^1312123653 is an apocalyptic number.

It is an amenable number.

1312123653 is a deficient number, since it is larger than the sum of its proper divisors (583166081).

1312123653 is a wasteful number, since it uses less digits than its factorization.

1312123653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145791523 (or 145791520 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 1312123653 is about 36223.2474110205. The cubic root of 1312123653 is about 1094.7751261496.

Adding to 1312123653 its reverse (3563212131), we get a palindrome (4875335784).

The spelling of 1312123653 in words is "one billion, three hundred twelve million, one hundred twenty-three thousand, six hundred fifty-three".