71138621 has 8 divisors (see below), whose sum is σ = 71801400. Its totient is φ = 70479360.

The previous prime is 71138581. The next prime is 71138623. The reversal of 71138621 is 12683117.

It can be written as a sum of positive squares in 4 ways, for example, as 47265625 + 23872996 = 6875^2 + 4886^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71138621 - 2²⁶ = 4029757 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 (71138623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54545 + ... + 55833.

It is an arithmetic number, because the mean of its divisors is an integer number (8975175).

Almost surely, 2^71138621 is an apocalyptic number.

It is an amenable number.

71138621 is a deficient number, since it is larger than the sum of its proper divisors (662779).

71138621 is a wasteful number, since it uses less digits than its factorization.

71138621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1759.

The product of its digits is 2016, while the sum is 29.

The square root of 71138621 is about 8434.3714051493. The cubic root of 71138621 is about 414.3510853359.

The spelling of 71138621 in words is "seventy-one million, one hundred thirty-eight thousand, six hundred twenty-one".