1315213540 has 24 divisors (see below), whose sum is σ = 2762863992. Its totient is φ = 525911040.

The previous prime is 1315213499. The next prime is 1315213547. The reversal of 1315213540 is 453125131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 77721856 + 1237491684 = 8816^2 + 35178^2 .

It is not an unprimeable number, because it can be changed into a prime (1315213547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63250 + ... + 81430.

It is an arithmetic number, because the mean of its divisors is an integer number (115119333).

Almost surely, 2^1315213540 is an apocalyptic number.

1315213540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1315213540 is an abundant number, since it is smaller than the sum of its proper divisors (1447650452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315213540 is a wasteful number, since it uses less digits than its factorization.

1315213540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21807 (or 21805 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 1315213540 is about 36265.8729386182. The cubic root of 1315213540 is about 1095.6338052809.

Adding to 1315213540 its reverse (453125131), we get a palindrome (1768338671).

The spelling of 1315213540 in words is "one billion, three hundred fifteen million, two hundred thirteen thousand, five hundred forty".