1225661233 has 8 divisors (see below), whose sum is σ = 1230088680. Its totient is φ = 1221242880.

The previous prime is 1225661183. The next prime is 1225661243. The reversal of 1225661233 is 3321665221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76247824 + 1149413409 = 8732^2 + 33903^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1225661233 - 2²⁹ = 688790321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225661195 and 1225661204.

It is not an unprimeable number, because it can be changed into a prime (1225661243) 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, 366513 + ... + 369841.

It is an arithmetic number, because the mean of its divisors is an integer number (153761085).

Almost surely, 2^1225661233 is an apocalyptic number.

It is an amenable number.

1225661233 is a deficient number, since it is larger than the sum of its proper divisors (4427447).

1225661233 is an equidigital number, since it uses as much as digits as its factorization.

1225661233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4547.

The product of its digits is 12960, while the sum is 31.

The square root of 1225661233 is about 35009.4449113379. Note that the first 3 decimals coincide. The cubic root of 1225661233 is about 1070.1799659445.

The spelling of 1225661233 in words is "one billion, two hundred twenty-five million, six hundred sixty-one thousand, two hundred thirty-three".