71979147 has 6 divisors (see below), whose sum is σ = 103969892. Its totient is φ = 47986092.

The previous prime is 71979113. The next prime is 71979199. The reversal of 71979147 is 74197917.

It is not a de Polignac number, because 71979147 - 2¹² = 71975051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71979107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3998833 + ... + 3998850.

Almost surely, 2^71979147 is an apocalyptic number.

71979147 is a deficient number, since it is larger than the sum of its proper divisors (31990745).

71979147 is a wasteful number, since it uses less digits than its factorization.

71979147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7997689 (or 7997686 counting only the distinct ones).

The product of its digits is 111132, while the sum is 45.

The square root of 71979147 is about 8484.0525104457. The cubic root of 71979147 is about 415.9765977805.

The spelling of 71979147 in words is "seventy-one million, nine hundred seventy-nine thousand, one hundred forty-seven".