1305223661 has 8 divisors (see below), whose sum is σ = 1505370240. Its totient is φ = 1108498608.

The previous prime is 1305223651. The next prime is 1305223663. The reversal of 1305223661 is 1663225031.

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

It is not a de Polignac number, because 1305223661 - 2²² = 1301029357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305223663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 854561 + ... + 856086.

It is an arithmetic number, because the mean of its divisors is an integer number (188171280).

Almost surely, 2^1305223661 is an apocalyptic number.

It is an amenable number.

1305223661 is a deficient number, since it is larger than the sum of its proper divisors (200146579).

1305223661 is a wasteful number, since it uses less digits than its factorization.

1305223661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710763.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 1305223661 is about 36127.8792762598. The cubic root of 1305223661 is about 1092.8527413764.

Adding to 1305223661 its reverse (1663225031), we get a palindrome (2968448692).

The spelling of 1305223661 in words is "one billion, three hundred five million, two hundred twenty-three thousand, six hundred sixty-one".