1220724325 has 6 divisors (see below), whose sum is σ = 1513698194. Its totient is φ = 976579440.

The previous prime is 1220724311. The next prime is 1220724343. The reversal of 1220724325 is 5234270221.

It can be written as a sum of positive squares in 3 ways, for example, as 118417924 + 1102306401 = 10882^2 + 33201^2 .

It is not a de Polignac number, because 1220724325 - 2⁹ = 1220723813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220724293 and 1220724302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24414462 + ... + 24414511.

Almost surely, 2^1220724325 is an apocalyptic number.

It is an amenable number.

1220724325 is a deficient number, since it is larger than the sum of its proper divisors (292973869).

1220724325 is an equidigital number, since it uses as much as digits as its factorization.

1220724325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48828983 (or 48828978 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 1220724325 is about 34938.8655368202. The cubic root of 1220724325 is about 1068.7411535581.

Adding to 1220724325 its reverse (5234270221), we get a palindrome (6454994546).

The spelling of 1220724325 in words is "one billion, two hundred twenty million, seven hundred twenty-four thousand, three hundred twenty-five".