65531897 has 4 divisors (see below), whose sum is σ = 65775780. Its totient is φ = 65288016.

The previous prime is 65531849. The next prime is 65531911. The reversal of 65531897 is 79813556.

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 24840256 + 40691641 = 4984^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 65531897 - 2¹⁶ = 65466361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65531827) 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, 121538 + ... + 122075.

It is an arithmetic number, because the mean of its divisors is an integer number (16443945).

Almost surely, 2^65531897 is an apocalyptic number.

It is an amenable number.

65531897 is a deficient number, since it is larger than the sum of its proper divisors (243883).

65531897 is a wasteful number, since it uses less digits than its factorization.

65531897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243882.

The product of its digits is 226800, while the sum is 44.

The square root of 65531897 is about 8095.1773915091. The cubic root of 65531897 is about 403.1663219625.

The spelling of 65531897 in words is "sixty-five million, five hundred thirty-one thousand, eight hundred ninety-seven".