1225440401 has 4 divisors (see below), whose sum is σ = 1248561972. Its totient is φ = 1202318832.

The previous prime is 1225440371. The next prime is 1225440467. The reversal of 1225440401 is 1040445221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1040445221 = 109 ⋅9545369.

It can be written as a sum of positive squares in 2 ways, for example, as 1007110225 + 218330176 = 31735^2 + 14776^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225440401 - 2¹⁰ = 1225439377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225440001) 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 3 ways as a sum of consecutive naturals, for example, 11560706 + ... + 11560811.

It is an arithmetic number, because the mean of its divisors is an integer number (312140493).

Almost surely, 2^1225440401 is an apocalyptic number.

It is an amenable number.

1225440401 is a deficient number, since it is larger than the sum of its proper divisors (23121571).

1225440401 is an equidigital number, since it uses as much as digits as its factorization.

1225440401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23121570.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1225440401 is about 35006.2908774980. The cubic root of 1225440401 is about 1070.1156892991.

Adding to 1225440401 its reverse (1040445221), we get a palindrome (2265885622).

The spelling of 1225440401 in words is "one billion, two hundred twenty-five million, four hundred forty thousand, four hundred one".