71957217 has 4 divisors (see below), whose sum is σ = 95942960. Its totient is φ = 47971476.

The previous prime is 71957213. The next prime is 71957227. The reversal of 71957217 is 71275917.

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.

It is not a de Polignac number, because 71957217 - 2² = 71957213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71957213) 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, 11992867 + ... + 11992872.

It is an arithmetic number, because the mean of its divisors is an integer number (23985740).

Almost surely, 2^71957217 is an apocalyptic number.

It is an amenable number.

71957217 is a deficient number, since it is larger than the sum of its proper divisors (23985743).

71957217 is a wasteful number, since it uses less digits than its factorization.

71957217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23985742.

The product of its digits is 30870, while the sum is 39.

The square root of 71957217 is about 8482.7599871740. The cubic root of 71957217 is about 415.9343480746.

The spelling of 71957217 in words is "seventy-one million, nine hundred fifty-seven thousand, two hundred seventeen".