71239247 has 4 divisors (see below), whose sum is σ = 71633016. Its totient is φ = 70845480.

The previous prime is 71239243. The next prime is 71239279. The reversal of 71239247 is 74293217.

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

It is a cyclic number.

It is not a de Polignac number, because 71239247 - 2² = 71239243 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 (71239243) 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, 196613 + ... + 196974.

It is an arithmetic number, because the mean of its divisors is an integer number (17908254).

Almost surely, 2^71239247 is an apocalyptic number.

71239247 is a deficient number, since it is larger than the sum of its proper divisors (393769).

71239247 is a wasteful number, since it uses less digits than its factorization.

71239247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393768.

The product of its digits is 21168, while the sum is 35.

The square root of 71239247 is about 8440.3345312849. The cubic root of 71239247 is about 414.5463606454.

The spelling of 71239247 in words is "seventy-one million, two hundred thirty-nine thousand, two hundred forty-seven".