1213315523 has 4 divisors (see below), whose sum is σ = 1386646320. Its totient is φ = 1039984728.

The previous prime is 1213315511. The next prime is 1213315561. The reversal of 1213315523 is 3255133121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1213315523 - 2⁸ = 1213315267 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213315492 and 1213315501.

It is not an unprimeable number, because it can be changed into a prime (1213315723) 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, 86665388 + ... + 86665401.

It is an arithmetic number, because the mean of its divisors is an integer number (346661580).

Almost surely, 2^1213315523 is an apocalyptic number.

1213315523 is a deficient number, since it is larger than the sum of its proper divisors (173330797).

1213315523 is an equidigital number, since it uses as much as digits as its factorization.

1213315523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173330796.

The product of its digits is 2700, while the sum is 26.

The square root of 1213315523 is about 34832.6789523861. The cubic root of 1213315523 is about 1066.5746352998.

Adding to 1213315523 its reverse (3255133121), we get a palindrome (4468448644).

The spelling of 1213315523 in words is "one billion, two hundred thirteen million, three hundred fifteen thousand, five hundred twenty-three".