71913313 has 8 divisors (see below), whose sum is σ = 73279656. Its totient is φ = 70560000.

The previous prime is 71913299. The next prime is 71913323. The reversal of 71913313 is 31331917.

It can be written as a sum of positive squares in 4 ways, for example, as 11881809 + 60031504 = 3447^2 + 7748^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71913313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71913323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8263 + ... + 14563.

It is an arithmetic number, because the mean of its divisors is an integer number (9159957).

Almost surely, 2^71913313 is an apocalyptic number.

It is an amenable number.

71913313 is a deficient number, since it is larger than the sum of its proper divisors (1366343).

71913313 is a wasteful number, since it uses less digits than its factorization.

71913313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6515.

The product of its digits is 1701, while the sum is 28.

The square root of 71913313 is about 8480.1717553361. The cubic root of 71913313 is about 415.8497380910.

The spelling of 71913313 in words is "seventy-one million, nine hundred thirteen thousand, three hundred thirteen".