1225222005 has 32 divisors (see below), whose sum is σ = 2292516864. Its totient is φ = 547073856.

The previous prime is 1225222001. The next prime is 1225222007. The reversal of 1225222005 is 5002225221.

It is not a de Polignac number, because 1225222005 - 2² = 1225222001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225222001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131169 + ... + 140198.

It is an arithmetic number, because the mean of its divisors is an integer number (71641152).

Almost surely, 2^1225222005 is an apocalyptic number.

1225222005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1225222005 is a deficient number, since it is larger than the sum of its proper divisors (1067294859).

1225222005 is a wasteful number, since it uses less digits than its factorization.

1225222005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271425.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 1225222005 is about 35003.1713563214. The cubic root of 1225222005 is about 1070.0521140949.

Adding to 1225222005 its reverse (5002225221), we get a palindrome (6227447226).

The spelling of 1225222005 in words is "one billion, two hundred twenty-five million, two hundred twenty-two thousand, five".