71616997 has 4 divisors (see below), whose sum is σ = 71693100. Its totient is φ = 71540896.

The previous prime is 71616991. The next prime is 71617001. The reversal of 71616997 is 79961617.

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 11383876 + 60233121 = 3374^2 + 7761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71616997 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 (71616991) 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, 36622 + ... + 38527.

It is an arithmetic number, because the mean of its divisors is an integer number (17923275).

Almost surely, 2^71616997 is an apocalyptic number.

It is an amenable number.

71616997 is a deficient number, since it is larger than the sum of its proper divisors (76103).

71616997 is an equidigital number, since it uses as much as digits as its factorization.

71616997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76102.

The product of its digits is 142884, while the sum is 46.

The square root of 71616997 is about 8462.6826125053. The cubic root of 71616997 is about 415.2777875975.

The spelling of 71616997 in words is "seventy-one million, six hundred sixteen thousand, nine hundred ninety-seven".