1225661223 has 16 divisors (see below), whose sum is σ = 1777114080. Its totient is φ = 748256256.

The previous prime is 1225661183. The next prime is 1225661243. The reversal of 1225661223 is 3221665221.

It is not a de Polignac number, because 1225661223 - 2¹⁰ = 1225660199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225661243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322878 + ... + 326651.

It is an arithmetic number, because the mean of its divisors is an integer number (111069630).

Almost surely, 2^1225661223 is an apocalyptic number.

1225661223 is a deficient number, since it is larger than the sum of its proper divisors (551452857).

1225661223 is a wasteful number, since it uses less digits than its factorization.

1225661223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649586.

The product of its digits is 8640, while the sum is 30.

The square root of 1225661223 is about 35009.4447685193. Note that the first 3 decimals coincide. The cubic root of 1225661223 is about 1070.1799630340.

The spelling of 1225661223 in words is "one billion, two hundred twenty-five million, six hundred sixty-one thousand, two hundred twenty-three".