1215322523 has 4 divisors (see below), whose sum is σ = 1223479200. Its totient is φ = 1207165848.

The previous prime is 1215322513. The next prime is 1215322529. The reversal of 1215322523 is 3252235121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3252235121 = 23 ⋅141401527.

It is a cyclic number.

It is not a de Polignac number, because 1215322523 - 2⁸ = 1215322267 is a prime.

It is a super-2 number, since 2×1215322523² = 2954017669822171058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1215322492 and 1215322501.

It is not an unprimeable number, because it can be changed into a prime (1215322529) 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, 4078115 + ... + 4078412.

It is an arithmetic number, because the mean of its divisors is an integer number (305869800).

Almost surely, 2^1215322523 is an apocalyptic number.

1215322523 is a deficient number, since it is larger than the sum of its proper divisors (8156677).

1215322523 is an equidigital number, since it uses as much as digits as its factorization.

1215322523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8156676.

The product of its digits is 3600, while the sum is 26.

The square root of 1215322523 is about 34861.4762022494. The cubic root of 1215322523 is about 1067.1624010925.

Adding to 1215322523 its reverse (3252235121), we get a palindrome (4467557644).

The spelling of 1215322523 in words is "one billion, two hundred fifteen million, three hundred twenty-two thousand, five hundred twenty-three".