1525320213 has 4 divisors (see below), whose sum is σ = 2033760288. Its totient is φ = 1016880140.

The previous prime is 1525320197. The next prime is 1525320241. The reversal of 1525320213 is 3120235251.

It is a happy number.

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 1525320213 - 2⁴ = 1525320197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1525320263) 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, 254220033 + ... + 254220038.

It is an arithmetic number, because the mean of its divisors is an integer number (508440072).

Almost surely, 2^1525320213 is an apocalyptic number.

It is an amenable number.

1525320213 is a deficient number, since it is larger than the sum of its proper divisors (508440075).

1525320213 is an equidigital number, since it uses as much as digits as its factorization.

1525320213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508440074.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 1525320213 is about 39055.3480716790. The cubic root of 1525320213 is about 1151.1193167476.

Adding to 1525320213 its reverse (3120235251), we get a palindrome (4645555464).

The spelling of 1525320213 in words is "one billion, five hundred twenty-five million, three hundred twenty thousand, two hundred thirteen".