1318503521 has 2 divisors, whose sum is σ = 1318503522. Its totient is φ = 1318503520.

The previous prime is 1318503491. The next prime is 1318503553. The reversal of 1318503521 is 1253058131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 843263521 + 475240000 = 29039^2 + 21800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1318503521 is a prime.

It is not a weakly prime, because it can be changed into another prime (1318503581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659251760 + 659251761.

It is an arithmetic number, because the mean of its divisors is an integer number (659251761).

Almost surely, 2^1318503521 is an apocalyptic number.

It is an amenable number.

1318503521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318503521 is an equidigital number, since it uses as much as digits as its factorization.

1318503521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 1318503521 is about 36311.2037944214. The cubic root of 1318503521 is about 1096.5466134393.

The spelling of 1318503521 in words is "one billion, three hundred eighteen million, five hundred three thousand, five hundred twenty-one".