1229561089577 has 4 divisors (see below), whose sum is σ = 1230107320656. Its totient is φ = 1229014858500.

The previous prime is 1229561089567. The next prime is 1229561089591. The reversal of 1229561089577 is 7759801659221.

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 a cyclic number.

It is not a de Polignac number, because 1229561089577 - 2¹² = 1229561085481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1229561089517) 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, 273112163 + ... + 273116664.

It is an arithmetic number, because the mean of its divisors is an integer number (307526830164).

Almost surely, 2^{1229561089577} is an apocalyptic number.

It is an amenable number.

1229561089577 is a deficient number, since it is larger than the sum of its proper divisors (546231079).

1229561089577 is an equidigital number, since it uses as much as digits as its factorization.

1229561089577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546231078.

The product of its (nonzero) digits is 19051200, while the sum is 62.

The spelling of 1229561089577 in words is "one trillion, two hundred twenty-nine billion, five hundred sixty-one million, eighty-nine thousand, five hundred seventy-seven".