1281224065 has 8 divisors (see below), whose sum is σ = 1677238848. Its totient is φ = 931799280.

The previous prime is 1281224033. The next prime is 1281224069. The reversal of 1281224065 is 5604221821.

1281224065 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1281224065 - 2⁵ = 1281224033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1281224069) 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, 11647437 + ... + 11647546.

It is an arithmetic number, because the mean of its divisors is an integer number (209654856).

Almost surely, 2^1281224065 is an apocalyptic number.

It is an amenable number.

1281224065 is a deficient number, since it is larger than the sum of its proper divisors (396014783).

1281224065 is a wasteful number, since it uses less digits than its factorization.

1281224065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23294999.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1281224065 is about 35794.1903805632. The cubic root of 1281224065 is about 1086.1130429942.

Adding to 1281224065 its reverse (5604221821), we get a palindrome (6885445886).

The spelling of 1281224065 in words is "one billion, two hundred eighty-one million, two hundred twenty-four thousand, sixty-five".