71505241 has 4 divisors (see below), whose sum is σ = 71541684. Its totient is φ = 71468800.

The previous prime is 71505223. The next prime is 71505253. The reversal of 71505241 is 14250517.

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 43837641 + 27667600 = 6621^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 71505241 - 2⁵ = 71505209 is a prime.

It is a super-2 number, since 2×71505241² = 10225998980936162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71505541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15100 + ... + 19261.

It is an arithmetic number, because the mean of its divisors is an integer number (17885421).

Almost surely, 2^71505241 is an apocalyptic number.

It is an amenable number.

71505241 is a deficient number, since it is larger than the sum of its proper divisors (36443).

71505241 is a wasteful number, since it uses less digits than its factorization.

71505241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36442.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 71505241 is about 8456.0771637917. The cubic root of 71505241 is about 415.0616659707.

Adding to 71505241 its reverse (14250517), we get a palindrome (85755758).

The spelling of 71505241 in words is "seventy-one million, five hundred five thousand, two hundred forty-one".