71315251 has 4 divisors (see below), whose sum is σ = 81503152. Its totient is φ = 61127352.

The previous prime is 71315219. The next prime is 71315281. The reversal of 71315251 is 15251317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15251317 = 643 ⋅23719.

It is a cyclic number.

It is not a de Polignac number, because 71315251 - 2⁵ = 71315219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71315281) 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, 5093940 + ... + 5093953.

It is an arithmetic number, because the mean of its divisors is an integer number (20375788).

Almost surely, 2^71315251 is an apocalyptic number.

71315251 is a deficient number, since it is larger than the sum of its proper divisors (10187901).

71315251 is a wasteful number, since it uses less digits than its factorization.

71315251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10187900.

The product of its digits is 1050, while the sum is 25.

The square root of 71315251 is about 8444.8357592081. The cubic root of 71315251 is about 414.6937325166.

Adding to 71315251 its reverse (15251317), we get a palindrome (86566568).

The spelling of 71315251 in words is "seventy-one million, three hundred fifteen thousand, two hundred fifty-one".