71204591 has 4 divisors (see below), whose sum is σ = 71221752. Its totient is φ = 71187432.

The previous prime is 71204587. The next prime is 71204593. The reversal of 71204591 is 19540217.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71204591 - 2² = 71204587 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 (71204593) 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 3 ways as a sum of consecutive naturals, for example, 1961 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (17805438).

Almost surely, 2^71204591 is an apocalyptic number.

71204591 is a deficient number, since it is larger than the sum of its proper divisors (17161).

71204591 is a wasteful number, since it uses less digits than its factorization.

71204591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17160.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 71204591 is about 8438.2812823465. The cubic root of 71204591 is about 414.4791278135.

It can be divided in two parts, 7120 and 4591, that added together give a palindrome (11711).

The spelling of 71204591 in words is "seventy-one million, two hundred four thousand, five hundred ninety-one".