71231647 has 4 divisors (see below), whose sum is σ = 71527456. Its totient is φ = 70935840.

The previous prime is 71231639. The next prime is 71231663. The reversal of 71231647 is 74613217.

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 71231647 - 2³ = 71231639 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71231617) 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, 147543 + ... + 148024.

It is an arithmetic number, because the mean of its divisors is an integer number (17881864).

Almost surely, 2^71231647 is an apocalyptic number.

71231647 is a deficient number, since it is larger than the sum of its proper divisors (295809).

71231647 is a wasteful number, since it uses less digits than its factorization.

71231647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295808.

The product of its digits is 7056, while the sum is 31.

The square root of 71231647 is about 8439.8843001548. The cubic root of 71231647 is about 414.5316184702.

The spelling of 71231647 in words is "seventy-one million, two hundred thirty-one thousand, six hundred forty-seven".