1213256065 has 8 divisors (see below), whose sum is σ = 1663894080. Its totient is φ = 831946992.

The previous prime is 1213256063. The next prime is 1213256071. The reversal of 1213256065 is 5606523121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213256065 - 2¹ = 1213256063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1213256063) 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, 17332195 + ... + 17332264.

It is an arithmetic number, because the mean of its divisors is an integer number (207986760).

Almost surely, 2^1213256065 is an apocalyptic number.

It is an amenable number.

1213256065 is a deficient number, since it is larger than the sum of its proper divisors (450638015).

1213256065 is an equidigital number, since it uses as much as digits as its factorization.

1213256065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34664471.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1213256065 is about 34831.8254617814. The cubic root of 1213256065 is about 1066.5572126730.

Adding to 1213256065 its reverse (5606523121), we get a palindrome (6819779186).

The spelling of 1213256065 in words is "one billion, two hundred thirteen million, two hundred fifty-six thousand, sixty-five".