245531221 has 12 divisors (see below), whose sum is σ = 280891492. Its totient is φ = 213308928.

The previous prime is 245531213. The next prime is 245531261. The reversal of 245531221 is 122135542.

It can be written as a sum of positive squares in 6 ways, for example, as 24860196 + 220671025 = 4986^2 + 14855^2 .

It is not a de Polignac number, because 245531221 - 2³ = 245531213 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 (245531261) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28920 + ... + 36433.

Almost surely, 2^245531221 is an apocalyptic number.

It is an amenable number.

245531221 is a deficient number, since it is larger than the sum of its proper divisors (35360271).

245531221 is a wasteful number, since it uses less digits than its factorization.

245531221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65400 (or 65383 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 245531221 is about 15669.4358864638. The cubic root of 245531221 is about 626.1843960319.

Adding to 245531221 its reverse (122135542), we get a palindrome (367666763).

The spelling of 245531221 in words is "two hundred forty-five million, five hundred thirty-one thousand, two hundred twenty-one".