102561065 has 4 divisors (see below), whose sum is σ = 123073284. Its totient is φ = 82048848.

The previous prime is 102561061. The next prime is 102561083. The reversal of 102561065 is 560165201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19149376 + 83411689 = 4376^2 + 9133^2 .

It is a cyclic number.

It is not a de Polignac number, because 102561065 - 2² = 102561061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102561061) 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, 10256102 + ... + 10256111.

It is an arithmetic number, because the mean of its divisors is an integer number (30768321).

Almost surely, 2^102561065 is an apocalyptic number.

It is an amenable number.

102561065 is a deficient number, since it is larger than the sum of its proper divisors (20512219).

102561065 is an equidigital number, since it uses as much as digits as its factorization.

102561065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20512218.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 102561065 is about 10127.2437020149. The cubic root of 102561065 is about 468.0879996817.

The spelling of 102561065 in words is "one hundred two million, five hundred sixty-one thousand, sixty-five".