1225855841 has 4 divisors (see below), whose sum is σ = 1400978112. Its totient is φ = 1050733572.

The previous prime is 1225855837. The next prime is 1225855849. The reversal of 1225855841 is 1485585221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1485585221 = 487 ⋅3050483.

It is not a de Polignac number, because 1225855841 - 2² = 1225855837 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225855849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 87561125 + ... + 87561138.

It is an arithmetic number, because the mean of its divisors is an integer number (350244528).

Almost surely, 2^1225855841 is an apocalyptic number.

It is an amenable number.

1225855841 is a deficient number, since it is larger than the sum of its proper divisors (175122271).

1225855841 is an equidigital number, since it uses as much as digits as its factorization.

1225855841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175122270.

The product of its digits is 128000, while the sum is 41.

The square root of 1225855841 is about 35012.2241652826. The cubic root of 1225855841 is about 1070.2366032805.

The spelling of 1225855841 in words is "one billion, two hundred twenty-five million, eight hundred fifty-five thousand, eight hundred forty-one".