71431617 has 4 divisors (see below), whose sum is σ = 95242160. Its totient is φ = 47621076.

The previous prime is 71431601. The next prime is 71431627. The reversal of 71431617 is 71613417.

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: 71613417 = 3 ⋅23871139.

It is not a de Polignac number, because 71431617 - 2⁴ = 71431601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71431627) 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, 11905267 + ... + 11905272.

It is an arithmetic number, because the mean of its divisors is an integer number (23810540).

Almost surely, 2^71431617 is an apocalyptic number.

It is an amenable number.

71431617 is a deficient number, since it is larger than the sum of its proper divisors (23810543).

71431617 is a wasteful number, since it uses less digits than its factorization.

71431617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23810542.

The product of its digits is 3528, while the sum is 30.

The square root of 71431617 is about 8451.7227238002. The cubic root of 71431617 is about 414.9191636233.

The spelling of 71431617 in words is "seventy-one million, four hundred thirty-one thousand, six hundred seventeen".