245221313 has 4 divisors (see below), whose sum is σ = 245261268. Its totient is φ = 245181360.

The previous prime is 245221309. The next prime is 245221337. The reversal of 245221313 is 313122542.

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 215267584 + 29953729 = 14672^2 + 5473^2 .

It is a cyclic number.

It is not a de Polignac number, because 245221313 - 2² = 245221309 is a prime.

It is a super-3 number, since 3×245221313³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245221393) 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, 8618 + ... + 23763.

It is an arithmetic number, because the mean of its divisors is an integer number (61315317).

Almost surely, 2^245221313 is an apocalyptic number.

It is an amenable number.

245221313 is a deficient number, since it is larger than the sum of its proper divisors (39955).

245221313 is an equidigital number, since it uses as much as digits as its factorization.

245221313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39954.

The product of its digits is 1440, while the sum is 23.

The square root of 245221313 is about 15659.5438311593. The cubic root of 245221313 is about 625.9208297432.

Adding to 245221313 its reverse (313122542), we get a palindrome (558343855).

The spelling of 245221313 in words is "two hundred forty-five million, two hundred twenty-one thousand, three hundred thirteen".