65171961 has 24 divisors (see below), whose sum is σ = 99665280. Its totient is φ = 40967136.

The previous prime is 65171947. The next prime is 65171969. The reversal of 65171961 is 16917156.

It is a happy number.

It is not a de Polignac number, because 65171961 - 2⁵ = 65171929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65171969) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8320 + ... + 14126.

It is an arithmetic number, because the mean of its divisors is an integer number (4152720).

Almost surely, 2^65171961 is an apocalyptic number.

It is an amenable number.

65171961 is a deficient number, since it is larger than the sum of its proper divisors (34493319).

65171961 is a wasteful number, since it uses less digits than its factorization.

65171961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885 (or 5882 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 65171961 is about 8072.9152726881. The cubic root of 65171961 is about 402.4268318577.

The spelling of 65171961 in words is "sixty-five million, one hundred seventy-one thousand, nine hundred sixty-one".