71545621 has 16 divisors (see below), whose sum is σ = 87260800. Its totient is φ = 57293568.

The previous prime is 71545603. The next prime is 71545631. The reversal of 71545621 is 12654517.

It is a cyclic number.

It is not a de Polignac number, because 71545621 - 2⁵ = 71545589 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 (71545631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6025 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (5453800).

Almost surely, 2^71545621 is an apocalyptic number.

It is an amenable number.

71545621 is a deficient number, since it is larger than the sum of its proper divisors (15715179).

71545621 is a wasteful number, since it uses less digits than its factorization.

71545621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7468.

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

The square root of 71545621 is about 8458.4644587537. The cubic root of 71545621 is about 415.1397816255.

The spelling of 71545621 in words is "seventy-one million, five hundred forty-five thousand, six hundred twenty-one".