1223280561 has 4 divisors (see below), whose sum is σ = 1631040752. Its totient is φ = 815520372.

The previous prime is 1223280559. The next prime is 1223280563. The reversal of 1223280561 is 1650823221.

1223280561 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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.

It is an interprime number because it is at equal distance from previous prime (1223280559) and next prime (1223280563).

It is not a de Polignac number, because 1223280561 - 2¹ = 1223280559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223280563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203880091 + ... + 203880096.

It is an arithmetic number, because the mean of its divisors is an integer number (407760188).

Almost surely, 2^1223280561 is an apocalyptic number.

It is an amenable number.

1223280561 is a deficient number, since it is larger than the sum of its proper divisors (407760191).

1223280561 is an equidigital number, since it uses as much as digits as its factorization.

1223280561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407760190.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1223280561 is about 34975.4279602123. The cubic root of 1223280561 is about 1069.4866262356.

The spelling of 1223280561 in words is "one billion, two hundred twenty-three million, two hundred eighty thousand, five hundred sixty-one".