1305221245 has 16 divisors (see below), whose sum is σ = 1654107840. Its totient is φ = 985976064.

The previous prime is 1305221221. The next prime is 1305221249. The reversal of 1305221245 is 5421225031.

It is a cyclic number.

It is not a de Polignac number, because 1305221245 - 2¹³ = 1305213053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305221249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6789 + ... + 51541.

It is an arithmetic number, because the mean of its divisors is an integer number (103381740).

Almost surely, 2^1305221245 is an apocalyptic number.

It is an amenable number.

1305221245 is a deficient number, since it is larger than the sum of its proper divisors (348886595).

1305221245 is a wasteful number, since it uses less digits than its factorization.

1305221245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45084.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1305221245 is about 36127.8458394629. The cubic root of 1305221245 is about 1092.8520670772.

Adding to 1305221245 its reverse (5421225031), we get a palindrome (6726446276).

The spelling of 1305221245 in words is "one billion, three hundred five million, two hundred twenty-one thousand, two hundred forty-five".