71126561 has 4 divisors (see below), whose sum is σ = 77592624. Its totient is φ = 64660500.

The previous prime is 71126537. The next prime is 71126563. The reversal of 71126561 is 16562117.

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 71126561 - 2²⁶ = 4017697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71126563) 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, 3233015 + ... + 3233036.

It is an arithmetic number, because the mean of its divisors is an integer number (19398156).

Almost surely, 2^71126561 is an apocalyptic number.

It is an amenable number.

71126561 is a deficient number, since it is larger than the sum of its proper divisors (6466063).

71126561 is a wasteful number, since it uses less digits than its factorization.

71126561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6466062.

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

The square root of 71126561 is about 8433.6564430856. The cubic root of 71126561 is about 414.3276692860.

Adding to 71126561 its reverse (16562117), we get a palindrome (87688678).

It can be divided in two parts, 711 and 26561, that added together give a palindrome (27272).

The spelling of 71126561 in words is "seventy-one million, one hundred twenty-six thousand, five hundred sixty-one".