1216420025 has 6 divisors (see below), whose sum is σ = 1508360862. Its totient is φ = 973136000.

The previous prime is 1216420003. The next prime is 1216420069. The reversal of 1216420025 is 5200246121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 712336 + 1215707689 = 844^2 + 34867^2 .

It is not a de Polignac number, because 1216420025 - 2⁶ = 1216419961 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24328376 + ... + 24328425.

It is an arithmetic number, because the mean of its divisors is an integer number (251393477).

Almost surely, 2^1216420025 is an apocalyptic number.

It is an amenable number.

1216420025 is a deficient number, since it is larger than the sum of its proper divisors (291940837).

1216420025 is an equidigital number, since it uses as much as digits as its factorization.

1216420025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48656811 (or 48656806 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1216420025 is about 34877.2135498236. The cubic root of 1216420025 is about 1067.4835395744.

Adding to 1216420025 its reverse (5200246121), we get a palindrome (6416666146).

The spelling of 1216420025 in words is "one billion, two hundred sixteen million, four hundred twenty thousand, twenty-five".