1318985653 has 4 divisors (see below), whose sum is σ = 1319084128. Its totient is φ = 1318887180.

The previous prime is 1318985639. The next prime is 1318985671. The reversal of 1318985653 is 3565898131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1318985653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1318985597 and 1318985606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318985693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25251 + ... + 57232.

It is an arithmetic number, because the mean of its divisors is an integer number (329771032).

Almost surely, 2^1318985653 is an apocalyptic number.

It is an amenable number.

1318985653 is a deficient number, since it is larger than the sum of its proper divisors (98475).

1318985653 is an equidigital number, since it uses as much as digits as its factorization.

1318985653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98474.

The product of its digits is 777600, while the sum is 49.

The square root of 1318985653 is about 36317.8420752115. The cubic root of 1318985653 is about 1096.6802537814.

The spelling of 1318985653 in words is "one billion, three hundred eighteen million, nine hundred eighty-five thousand, six hundred fifty-three".