71254561 has 8 divisors (see below), whose sum is σ = 81496064. Its totient is φ = 61028640.

The previous prime is 71254553. The next prime is 71254583. The reversal of 71254561 is 16545217.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71254561 - 2³ = 71254553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71254501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8581 + ... + 14701.

It is an arithmetic number, because the mean of its divisors is an integer number (10187008).

Almost surely, 2^71254561 is an apocalyptic number.

It is an amenable number.

71254561 is a deficient number, since it is larger than the sum of its proper divisors (10241503).

71254561 is a wasteful number, since it uses less digits than its factorization.

71254561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7791.

The product of its digits is 8400, while the sum is 31.

The square root of 71254561 is about 8441.2416740667. The cubic root of 71254561 is about 414.5760629439.

Adding to 71254561 its reverse (16545217), we get a palindrome (87799778).

The spelling of 71254561 in words is "seventy-one million, two hundred fifty-four thousand, five hundred sixty-one".