1318021653 has 16 divisors (see below), whose sum is σ = 1901043200. Its totient is φ = 807447744.

The previous prime is 1318021651. The next prime is 1318021703. The reversal of 1318021653 is 3561208131.

It is not a de Polignac number, because 1318021653 - 2¹ = 1318021651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1318021653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318021651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67078 + ... + 84471.

It is an arithmetic number, because the mean of its divisors is an integer number (118815200).

Almost surely, 2^1318021653 is an apocalyptic number.

1318021653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1318021653 is a deficient number, since it is larger than the sum of its proper divisors (583021547).

1318021653 is a wasteful number, since it uses less digits than its factorization.

1318021653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151788.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1318021653 is about 36304.5679357295. The cubic root of 1318021653 is about 1096.4130137187.

Adding to 1318021653 its reverse (3561208131), we get a palindrome (4879229784).

The spelling of 1318021653 in words is "one billion, three hundred eighteen million, twenty-one thousand, six hundred fifty-three".