71422561 has 4 divisors (see below), whose sum is σ = 81625792. Its totient is φ = 61219332.

The previous prime is 71422553. The next prime is 71422583. The reversal of 71422561 is 16522417.

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 71422561 - 2³ = 71422553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71422541) 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, 5101605 + ... + 5101618.

It is an arithmetic number, because the mean of its divisors is an integer number (20406448).

Almost surely, 2^71422561 is an apocalyptic number.

It is an amenable number.

71422561 is a deficient number, since it is larger than the sum of its proper divisors (10203231).

71422561 is a wasteful number, since it uses less digits than its factorization.

71422561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203230.

The product of its digits is 3360, while the sum is 28.

The square root of 71422561 is about 8451.1869580551. The cubic root of 71422561 is about 414.9016285928.

Adding to 71422561 its reverse (16522417), we get a palindrome (87944978).

The spelling of 71422561 in words is "seventy-one million, four hundred twenty-two thousand, five hundred sixty-one".