71271551 has 4 divisors (see below), whose sum is σ = 76753992. Its totient is φ = 65789112.

The previous prime is 71271539. The next prime is 71271581. The reversal of 71271551 is 15517217.

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 71271551 - 2¹⁰ = 71270527 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 (71271581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2741201 + ... + 2741226.

It is an arithmetic number, because the mean of its divisors is an integer number (19188498).

Almost surely, 2^71271551 is an apocalyptic number.

71271551 is a deficient number, since it is larger than the sum of its proper divisors (5482441).

71271551 is a wasteful number, since it uses less digits than its factorization.

71271551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5482440.

The product of its digits is 2450, while the sum is 29.

The square root of 71271551 is about 8442.2479826170. The cubic root of 71271551 is about 414.6090109519.

Adding to 71271551 its reverse (15517217), we get a palindrome (86788768).

The spelling of 71271551 in words is "seventy-one million, two hundred seventy-one thousand, five hundred fifty-one".