71263261 has 4 divisors (see below), whose sum is σ = 71281152. Its totient is φ = 71245372.

The previous prime is 71263193. The next prime is 71263271. The reversal of 71263261 is 16236217.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71263261 - 2¹³ = 71255069 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 (71263271) 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, 36 + ... + 11938.

It is an arithmetic number, because the mean of its divisors is an integer number (17820288).

Almost surely, 2^71263261 is an apocalyptic number.

It is an amenable number.

71263261 is a deficient number, since it is larger than the sum of its proper divisors (17891).

71263261 is a wasteful number, since it uses less digits than its factorization.

71263261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17890.

The product of its digits is 3024, while the sum is 28.

The square root of 71263261 is about 8441.7569853674. The cubic root of 71263261 is about 414.5929351502.

Adding to 71263261 its reverse (16236217), we get a palindrome (87499478).

The spelling of 71263261 in words is "seventy-one million, two hundred sixty-three thousand, two hundred sixty-one".