2065129081 has 4 divisors (see below), whose sum is σ = 2067297012. Its totient is φ = 2062961152.

The previous prime is 2065129069. The next prime is 2065129097. The reversal of 2065129081 is 1809215602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1809215602 = 2 ⋅904607801.

It can be written as a sum of positive squares in 2 ways, for example, as 1637011600 + 428117481 = 40460^2 + 20691^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065129081 - 2⁵ = 2065129049 is a prime.

It is a super-2 number, since 2×2065129081² = 8529516242383809122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2065129061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082536 + ... + 1084441.

It is an arithmetic number, because the mean of its divisors is an integer number (516824253).

Almost surely, 2^2065129081 is an apocalyptic number.

It is an amenable number.

2065129081 is a deficient number, since it is larger than the sum of its proper divisors (2167931).

2065129081 is an equidigital number, since it uses as much as digits as its factorization.

2065129081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167930.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 2065129081 is about 45443.6913223387. The cubic root of 2065129081 is about 1273.4514751011.

The spelling of 2065129081 in words is "two billion, sixty-five million, one hundred twenty-nine thousand, eighty-one".