65205131 has 4 divisors (see below), whose sum is σ = 68637000. Its totient is φ = 61773264.

The previous prime is 65205113. The next prime is 65205139. The reversal of 65205131 is 13150256.

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

It is a cyclic number.

It is not a de Polignac number, because 65205131 - 2¹⁰ = 65204107 is a prime.

It is a super-2 number, since 2×65205131² = 8503418217454322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65205097 and 65205106.

It is not an unprimeable number, because it can be changed into a prime (65205139) 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, 1715906 + ... + 1715943.

It is an arithmetic number, because the mean of its divisors is an integer number (17159250).

Almost surely, 2^65205131 is an apocalyptic number.

65205131 is a deficient number, since it is larger than the sum of its proper divisors (3431869).

65205131 is a wasteful number, since it uses less digits than its factorization.

65205131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3431868.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 65205131 is about 8074.9694117068. The cubic root of 65205131 is about 402.4950934937.

Adding to 65205131 its reverse (13150256), we get a palindrome (78355387).

The spelling of 65205131 in words is "sixty-five million, two hundred five thousand, one hundred thirty-one".