1245360521 has 4 divisors (see below), whose sum is σ = 1248319044. Its totient is φ = 1242402000.

The previous prime is 1245360497. The next prime is 1245360533. The reversal of 1245360521 is 1250635421.

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 502252921 + 743107600 = 22411^2 + 27260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245360521 - 2¹⁴ = 1245344137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245360121) 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, 1478630 + ... + 1479471.

It is an arithmetic number, because the mean of its divisors is an integer number (312079761).

Almost surely, 2^1245360521 is an apocalyptic number.

It is an amenable number.

1245360521 is a deficient number, since it is larger than the sum of its proper divisors (2958523).

1245360521 is an equidigital number, since it uses as much as digits as its factorization.

1245360521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2958522.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1245360521 is about 35289.6659236100. The cubic root of 1245360521 is about 1075.8829654981.

Adding to 1245360521 its reverse (1250635421), we get a palindrome (2495995942).

The spelling of 1245360521 in words is "one billion, two hundred forty-five million, three hundred sixty thousand, five hundred twenty-one".