1225350561 has 8 divisors (see below), whose sum is σ = 1634124544. Its totient is φ = 816738480.

The previous prime is 1225350541. The next prime is 1225350569. The reversal of 1225350561 is 1650535221.

It is a happy number.

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

It is not a de Polignac number, because 1225350561 - 2⁷ = 1225350433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225350569) 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, 21550 + ... + 53991.

It is an arithmetic number, because the mean of its divisors is an integer number (204265568).

Almost surely, 2^1225350561 is an apocalyptic number.

It is an amenable number.

1225350561 is a deficient number, since it is larger than the sum of its proper divisors (408773983).

1225350561 is an equidigital number, since it uses as much as digits as its factorization.

1225350561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80951.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 1225350561 is about 35005.0076560483. The cubic root of 1225350561 is about 1070.0895377368.

Adding to 1225350561 its reverse (1650535221), we get a palindrome (2875885782).

The spelling of 1225350561 in words is "one billion, two hundred twenty-five million, three hundred fifty thousand, five hundred sixty-one".