1213015315 has 4 divisors (see below), whose sum is σ = 1455618384. Its totient is φ = 970412248.

The previous prime is 1213015313. The next prime is 1213015319. The reversal of 1213015315 is 5135103121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5135103121 = 173 ⋅29682677.

It is a cyclic number.

It is not a de Polignac number, because 1213015315 - 2¹ = 1213015313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213015313) 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, 121301527 + ... + 121301536.

It is an arithmetic number, because the mean of its divisors is an integer number (363904596).

Almost surely, 2^1213015315 is an apocalyptic number.

1213015315 is a deficient number, since it is larger than the sum of its proper divisors (242603069).

1213015315 is an equidigital number, since it uses as much as digits as its factorization.

1213015315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242603068.

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

The square root of 1213015315 is about 34828.3693990976. The cubic root of 1213015315 is about 1066.4866613024.

Adding to 1213015315 its reverse (5135103121), we get a palindrome (6348118436).

The spelling of 1213015315 in words is "one billion, two hundred thirteen million, fifteen thousand, three hundred fifteen".