71621541 has 12 divisors (see below), whose sum is σ = 104871468. Its totient is φ = 47093184.

The previous prime is 71621509. The next prime is 71621549. The reversal of 71621541 is 14512617.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49999041 + 21622500 = 7071^2 + 4650^2 .

It is not a de Polignac number, because 71621541 - 2⁵ = 71621509 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71621549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53850 + ... + 55163.

It is an arithmetic number, because the mean of its divisors is an integer number (8739289).

Almost surely, 2^71621541 is an apocalyptic number.

It is an amenable number.

71621541 is a deficient number, since it is larger than the sum of its proper divisors (33249927).

71621541 is a wasteful number, since it uses less digits than its factorization.

71621541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109092 (or 109089 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 71621541 is about 8462.9510810355. The cubic root of 71621541 is about 415.2865703467.

The spelling of 71621541 in words is "seventy-one million, six hundred twenty-one thousand, five hundred forty-one".