1315243521 has 16 divisors (see below), whose sum is σ = 1952925120. Its totient is φ = 874841760.

The previous prime is 1315243507. The next prime is 1315243549. The reversal of 1315243521 is 1253425131.

1315243521 is a `hidden beast` number, since 131 + 5 + 2 + 4 + 3 + 521 = 666.

It is not a de Polignac number, because 1315243521 - 2⁷ = 1315243393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1315242521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43020 + ... + 66941.

It is an arithmetic number, because the mean of its divisors is an integer number (122057820).

Almost surely, 2^1315243521 is an apocalyptic number.

It is an amenable number.

1315243521 is a deficient number, since it is larger than the sum of its proper divisors (637681599).

1315243521 is a wasteful number, since it uses less digits than its factorization.

1315243521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110413 (or 110407 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1315243521 is about 36266.2862863018. The cubic root of 1315243521 is about 1095.6421304050.

Adding to 1315243521 its reverse (1253425131), we get a palindrome (2568668652).

The spelling of 1315243521 in words is "one billion, three hundred fifteen million, two hundred forty-three thousand, five hundred twenty-one".