71144993 has 4 divisors (see below), whose sum is σ = 71168388. Its totient is φ = 71121600.

The previous prime is 71144959. The next prime is 71144999. The reversal of 71144993 is 39944117.

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 6390784 + 64754209 = 2528^2 + 8047^2 .

It is a cyclic number.

It is not a de Polignac number, because 71144993 - 2⁶ = 71144929 is a prime.

It is a super-2 number, since 2×71144993² = 10123220057940098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71144999) 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, 6308 + ... + 13493.

It is an arithmetic number, because the mean of its divisors is an integer number (17792097).

Almost surely, 2^71144993 is an apocalyptic number.

It is an amenable number.

71144993 is a deficient number, since it is larger than the sum of its proper divisors (23395).

71144993 is a wasteful number, since it uses less digits than its factorization.

71144993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23394.

The product of its digits is 27216, while the sum is 38.

The square root of 71144993 is about 8434.7491367556. The cubic root of 71144993 is about 414.3634563295.

The spelling of 71144993 in words is "seventy-one million, one hundred forty-four thousand, nine hundred ninety-three".