1220445025 has 12 divisors (see below), whose sum is σ = 1534084972. Its totient is φ = 962979840.

The previous prime is 1220445007. The next prime is 1220445047. The reversal of 1220445025 is 5205440221.

It can be written as a sum of positive squares in 6 ways, for example, as 64513024 + 1155932001 = 8032^2 + 33999^2 .

It is not a de Polignac number, because 1220445025 - 2¹⁵ = 1220412257 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332544 + ... + 336193.

Almost surely, 2^1220445025 is an apocalyptic number.

It is an amenable number.

1220445025 is a deficient number, since it is larger than the sum of its proper divisors (313639947).

1220445025 is an equidigital number, since it uses as much as digits as its factorization.

1220445025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668820 (or 668815 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 1220445025 is about 34934.8683266447. The cubic root of 1220445025 is about 1068.6596385192.

Adding to 1220445025 its reverse (5205440221), we get a palindrome (6425885246).

The spelling of 1220445025 in words is "one billion, two hundred twenty million, four hundred forty-five thousand, twenty-five".