1225421265 has 8 divisors (see below), whose sum is σ = 1960674048. Its totient is φ = 653558000.

The previous prime is 1225421261. The next prime is 1225421311. The reversal of 1225421265 is 5621245221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225421265 - 2² = 1225421261 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1225421261) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40847361 + ... + 40847390.

It is an arithmetic number, because the mean of its divisors is an integer number (245084256).

Almost surely, 2^1225421265 is an apocalyptic number.

1225421265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225421265 is a deficient number, since it is larger than the sum of its proper divisors (735252783).

1225421265 is an equidigital number, since it uses as much as digits as its factorization.

1225421265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81694759.

The product of its digits is 9600, while the sum is 30.

The square root of 1225421265 is about 35006.0175541292. The cubic root of 1225421265 is about 1070.1101191002.

Adding to 1225421265 its reverse (5621245221), we get a palindrome (6846666486).

The spelling of 1225421265 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, two hundred sixty-five".