1301920065 has 12 divisors (see below), whose sum is σ = 2256661524. Its totient is φ = 694357344.

The previous prime is 1301920063. The next prime is 1301920091. The reversal of 1301920065 is 5600291031.

It can be written as a sum of positive squares in 2 ways, for example, as 523677456 + 778242609 = 22884^2 + 27897^2 .

It is not a de Polignac number, because 1301920065 - 2¹ = 1301920063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1301920063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14465734 + ... + 14465823.

It is an arithmetic number, because the mean of its divisors is an integer number (188055127).

Almost surely, 2^1301920065 is an apocalyptic number.

1301920065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1301920065 is a deficient number, since it is larger than the sum of its proper divisors (954741459).

1301920065 is a wasteful number, since it uses less digits than its factorization.

1301920065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28931568 (or 28931565 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1301920065 is about 36082.1294410405. The cubic root of 1301920065 is about 1091.9299380441.

The spelling of 1301920065 in words is "one billion, three hundred one million, nine hundred twenty thousand, sixty-five".