71445117 has 4 divisors (see below), whose sum is σ = 95260160. Its totient is φ = 47630076.

The previous prime is 71445103. The next prime is 71445119. The reversal of 71445117 is 71154417.

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 71445117 - 2²⁶ = 4336253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71445119) 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, 11907517 + ... + 11907522.

It is an arithmetic number, because the mean of its divisors is an integer number (23815040).

Almost surely, 2^71445117 is an apocalyptic number.

It is an amenable number.

71445117 is a deficient number, since it is larger than the sum of its proper divisors (23815043).

71445117 is a wasteful number, since it uses less digits than its factorization.

71445117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23815042.

The product of its digits is 3920, while the sum is 30.

The square root of 71445117 is about 8452.5213398133. The cubic root of 71445117 is about 414.9453007696.

The spelling of 71445117 in words is "seventy-one million, four hundred forty-five thousand, one hundred seventeen".