1521313213 has 4 divisors (see below), whose sum is σ = 1738643680. Its totient is φ = 1303982748.

The previous prime is 1521313163. The next prime is 1521313231. The reversal of 1521313213 is 3123131251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1521313213 - 2¹⁷ = 1521182141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521313253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108665223 + ... + 108665236.

It is an arithmetic number, because the mean of its divisors is an integer number (434660920).

Almost surely, 2^1521313213 is an apocalyptic number.

It is an amenable number.

1521313213 is a deficient number, since it is larger than the sum of its proper divisors (217330467).

1521313213 is an equidigital number, since it uses as much as digits as its factorization.

1521313213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217330466.

The product of its digits is 540, while the sum is 22.

The square root of 1521313213 is about 39004.0153445770. The cubic root of 1521313213 is about 1150.1104400552.

Adding to 1521313213 its reverse (3123131251), we get a palindrome (4644444464).

The spelling of 1521313213 in words is "one billion, five hundred twenty-one million, three hundred thirteen thousand, two hundred thirteen".