71965217 has 4 divisors (see below), whose sum is σ = 75752880. Its totient is φ = 68177556.

The previous prime is 71965193. The next prime is 71965249. The reversal of 71965217 is 71256917.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71256917 = 163 ⋅437159.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71965217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71965297) 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, 1893803 + ... + 1893840.

It is an arithmetic number, because the mean of its divisors is an integer number (18938220).

Almost surely, 2^71965217 is an apocalyptic number.

It is an amenable number.

71965217 is a deficient number, since it is larger than the sum of its proper divisors (3787663).

71965217 is a wasteful number, since it uses less digits than its factorization.

71965217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787662.

The product of its digits is 26460, while the sum is 38.

The square root of 71965217 is about 8483.2315187080. The cubic root of 71965217 is about 415.9497616384.

The spelling of 71965217 in words is "seventy-one million, nine hundred sixty-five thousand, two hundred seventeen".