1215015313 has 4 divisors (see below), whose sum is σ = 1286486820. Its totient is φ = 1143543808.

The previous prime is 1215015311. The next prime is 1215015323. The reversal of 1215015313 is 3135105121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3135105121 = 709 ⋅4421869.

It can be written as a sum of positive squares in 2 ways, for example, as 495863824 + 719151489 = 22268^2 + 26817^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215015313 - 2¹ = 1215015311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215015311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35735728 + ... + 35735761.

It is an arithmetic number, because the mean of its divisors is an integer number (321621705).

Almost surely, 2^1215015313 is an apocalyptic number.

It is an amenable number.

1215015313 is a deficient number, since it is larger than the sum of its proper divisors (71471507).

1215015313 is an equidigital number, since it uses as much as digits as its factorization.

1215015313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71471506.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1215015313 is about 34857.0697707079. The cubic root of 1215015313 is about 1067.0724741847.

The spelling of 1215015313 in words is "one billion, two hundred fifteen million, fifteen thousand, three hundred thirteen".