71284997 has 4 divisors (see below), whose sum is σ = 81468576. Its totient is φ = 61101420.

The previous prime is 71284991. The next prime is 71284999. The reversal of 71284997 is 79948217.

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 a cyclic number.

It is not a de Polignac number, because 71284997 - 2⁶ = 71284933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71284991) 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, 5091779 + ... + 5091792.

It is an arithmetic number, because the mean of its divisors is an integer number (20367144).

Almost surely, 2^71284997 is an apocalyptic number.

It is an amenable number.

71284997 is a deficient number, since it is larger than the sum of its proper divisors (10183579).

71284997 is a wasteful number, since it uses less digits than its factorization.

71284997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183578.

The product of its digits is 254016, while the sum is 47.

The square root of 71284997 is about 8443.0442969346. The cubic root of 71284997 is about 414.6350825150.

The spelling of 71284997 in words is "seventy-one million, two hundred eighty-four thousand, nine hundred ninety-seven".