71243401 has 12 divisors (see below), whose sum is σ = 74885580. Its totient is φ = 67697280.

The previous prime is 71243387. The next prime is 71243423. The reversal of 71243401 is 10434217.

It can be written as a sum of positive squares in 6 ways, for example, as 9801 + 71233600 = 99^2 + 8440^2 .

It is not a de Polignac number, because 71243401 - 2⁷ = 71243273 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 (71243201) 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 11 ways as a sum of consecutive naturals, for example, 154311 + ... + 154771.

It is an arithmetic number, because the mean of its divisors is an integer number (6240465).

Almost surely, 2^71243401 is an apocalyptic number.

It is an amenable number.

71243401 is a deficient number, since it is larger than the sum of its proper divisors (3642179).

71243401 is an equidigital number, since it uses as much as digits as its factorization.

71243401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 71243401 is about 8440.5806079914. The cubic root of 71243401 is about 414.5544179649.

Adding to 71243401 its reverse (10434217), we get a palindrome (81677618).

The spelling of 71243401 in words is "seventy-one million, two hundred forty-three thousand, four hundred one".