71219393 has 6 divisors (see below), whose sum is σ = 82847106. Its totient is φ = 61045152.

The previous prime is 71219387. The next prime is 71219399. The reversal of 71219393 is 39391217.

It is an interprime number because it is at equal distance from previous prime (71219387) and next prime (71219399).

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 20638849 = 7112^2 + 4543^2 .

It is not a de Polignac number, because 71219393 - 2⁴ = 71219377 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71219399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 726680 + ... + 726777.

It is an arithmetic number, because the mean of its divisors is an integer number (13807851).

Almost surely, 2^71219393 is an apocalyptic number.

It is an amenable number.

71219393 is a deficient number, since it is larger than the sum of its proper divisors (11627713).

71219393 is a wasteful number, since it uses less digits than its factorization.

71219393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453471 (or 1453464 counting only the distinct ones).

The product of its digits is 10206, while the sum is 35.

The square root of 71219393 is about 8439.1583111114. The cubic root of 71219393 is about 414.5078464439.

The spelling of 71219393 in words is "seventy-one million, two hundred nineteen thousand, three hundred ninety-three".