72041621 has 2 divisors, whose sum is σ = 72041622. Its totient is φ = 72041620.

The previous prime is 72041611. The next prime is 72041623. The reversal of 72041621 is 12614027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41460721 + 30580900 = 6439^2 + 5530^2 .

It is a cyclic number.

It is not a de Polignac number, because 72041621 - 2¹⁴ = 72025237 is a prime.

Together with 72041623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72041623) 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 as a sum of consecutive naturals, namely, 36020810 + 36020811.

It is an arithmetic number, because the mean of its divisors is an integer number (36020811).

Almost surely, 2^72041621 is an apocalyptic number.

It is an amenable number.

72041621 is a deficient number, since it is larger than the sum of its proper divisors (1).

72041621 is an equidigital number, since it uses as much as digits as its factorization.

72041621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 72041621 is about 8487.7335608512. The cubic root of 72041621 is about 416.0969113622.

Adding to 72041621 its reverse (12614027), we get a palindrome (84655648).

The spelling of 72041621 in words is "seventy-two million, forty-one thousand, six hundred twenty-one".