71239061 has 4 divisors (see below), whose sum is σ = 75429612. Its totient is φ = 67048512.

The previous prime is 71239039. The next prime is 71239067. The reversal of 71239061 is 16093217.

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 66748900 + 4490161 = 8170^2 + 2119^2 .

It is a cyclic number.

It is not a de Polignac number, because 71239061 - 2⁶ = 71238997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71239067) 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 3 ways as a sum of consecutive naturals, for example, 2095250 + ... + 2095283.

It is an arithmetic number, because the mean of its divisors is an integer number (18857403).

Almost surely, 2^71239061 is an apocalyptic number.

It is an amenable number.

71239061 is a deficient number, since it is larger than the sum of its proper divisors (4190551).

71239061 is a wasteful number, since it uses less digits than its factorization.

71239061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190550.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 71239061 is about 8440.3235127571. The cubic root of 71239061 is about 414.5459998626.

The spelling of 71239061 in words is "seventy-one million, two hundred thirty-nine thousand, sixty-one".