71138287 has 16 divisors (see below), whose sum is σ = 81326592. Its totient is φ = 61594720.

The previous prime is 71138279. The next prime is 71138303. The reversal of 71138287 is 78283117.

It is not a de Polignac number, because 71138287 - 2³ = 71138279 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 (71138227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79758 + ... + 80644.

It is an arithmetic number, because the mean of its divisors is an integer number (5082912).

Almost surely, 2^71138287 is an apocalyptic number.

71138287 is a deficient number, since it is larger than the sum of its proper divisors (10188305).

71138287 is a wasteful number, since it uses less digits than its factorization.

71138287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238.

The product of its digits is 18816, while the sum is 37.

The square root of 71138287 is about 8434.3516051917. The cubic root of 71138287 is about 414.3504368673.

It can be divided in two parts, 7113 and 8287, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 71138287 in words is "seventy-one million, one hundred thirty-eight thousand, two hundred eighty-seven".