65171979 has 8 divisors (see below), whose sum is σ = 96551120. Its totient is φ = 43447968.

The previous prime is 65171971. The next prime is 65171993. The reversal of 65171979 is 97917156.

65171979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65171979 - 2³ = 65171971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65171971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1206862 + ... + 1206915.

It is an arithmetic number, because the mean of its divisors is an integer number (12068890).

Almost surely, 2^65171979 is an apocalyptic number.

65171979 is a deficient number, since it is larger than the sum of its proper divisors (31379141).

65171979 is a wasteful number, since it uses less digits than its factorization.

65171979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2413786 (or 2413780 counting only the distinct ones).

The product of its digits is 119070, while the sum is 45.

The square root of 65171979 is about 8072.9163875269. The cubic root of 65171979 is about 402.4268689068.

The spelling of 65171979 in words is "sixty-five million, one hundred seventy-one thousand, nine hundred seventy-nine".