71516317 has 4 divisors (see below), whose sum is σ = 72172540. Its totient is φ = 70860096.

The previous prime is 71516311. The next prime is 71516363. The reversal of 71516317 is 71361517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62552281 + 8964036 = 7909^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 71516317 - 2³ = 71516309 is a prime.

It is a super-2 number, since 2×71516317² = 10229167194488978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71516311) 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, 327948 + ... + 328165.

It is an arithmetic number, because the mean of its divisors is an integer number (18043135).

Almost surely, 2^71516317 is an apocalyptic number.

It is an amenable number.

71516317 is a deficient number, since it is larger than the sum of its proper divisors (656223).

71516317 is a wasteful number, since it uses less digits than its factorization.

71516317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656222.

The product of its digits is 4410, while the sum is 31.

The square root of 71516317 is about 8456.7320520400. The cubic root of 71516317 is about 415.0830955685.

The spelling of 71516317 in words is "seventy-one million, five hundred sixteen thousand, three hundred seventeen".