71139534 has 16 divisors (see below), whose sum is σ = 149767680. Its totient is φ = 22465080.

The previous prime is 71139533. The next prime is 71139539. The reversal of 71139534 is 43593117.

It is a junction number, because it is equal to n+sod(n) for n = 71139495 and 71139504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71139533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311902 + ... + 312129.

It is an arithmetic number, because the mean of its divisors is an integer number (9360480).

Almost surely, 2^71139534 is an apocalyptic number.

71139534 is an abundant number, since it is smaller than the sum of its proper divisors (78628146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71139534 is a wasteful number, since it uses less digits than its factorization.

71139534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624055.

The product of its digits is 11340, while the sum is 33.

The square root of 71139534 is about 8434.4255287482. The cubic root of 71139534 is about 414.3528579357.

The spelling of 71139534 in words is "seventy-one million, one hundred thirty-nine thousand, five hundred thirty-four".