71397013 has 4 divisors (see below), whose sum is σ = 73326700. Its totient is φ = 69467328.

The previous prime is 71396977. The next prime is 71397017. The reversal of 71397013 is 31079317.

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 26801329 + 44595684 = 5177^2 + 6678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71397013 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 (71397017) 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, 964788 + ... + 964861.

It is an arithmetic number, because the mean of its divisors is an integer number (18331675).

Almost surely, 2^71397013 is an apocalyptic number.

It is an amenable number.

71397013 is a deficient number, since it is larger than the sum of its proper divisors (1929687).

71397013 is a wasteful number, since it uses less digits than its factorization.

71397013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929686.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 71397013 is about 8449.6753192061. The cubic root of 71397013 is about 414.8521522985.

The spelling of 71397013 in words is "seventy-one million, three hundred ninety-seven thousand, thirteen".