1230525521 has 4 divisors (see below), whose sum is σ = 1242709044. Its totient is φ = 1218342000.

The previous prime is 1230525487. The next prime is 1230525533. The reversal of 1230525521 is 1255250321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 914397121 + 316128400 = 30239^2 + 17780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1230525521 - 2¹⁰ = 1230524497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1230525421) 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, 6091610 + ... + 6091811.

It is an arithmetic number, because the mean of its divisors is an integer number (310677261).

Almost surely, 2^1230525521 is an apocalyptic number.

It is an amenable number.

1230525521 is a deficient number, since it is larger than the sum of its proper divisors (12183523).

1230525521 is a wasteful number, since it uses less digits than its factorization.

1230525521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12183522.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 1230525521 is about 35078.8472016969. The cubic root of 1230525521 is about 1071.5938400746.

Adding to 1230525521 its reverse (1255250321), we get a palindrome (2485775842).

The spelling of 1230525521 in words is "one billion, two hundred thirty million, five hundred twenty-five thousand, five hundred twenty-one".