28971541 has 2 divisors, whose sum is σ = 28971542. Its totient is φ = 28971540.

The previous prime is 28971533. The next prime is 28971601. The reversal of 28971541 is 14517982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27783441 + 1188100 = 5271^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 28971541 - 2³ = 28971533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28971541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28971511) 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, 14485770 + 14485771.

It is an arithmetic number, because the mean of its divisors is an integer number (14485771).

Almost surely, 2^28971541 is an apocalyptic number.

It is an amenable number.

28971541 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971541 is an equidigital number, since it uses as much as digits as its factorization.

28971541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 37.

The square root of 28971541 is about 5382.5218067371. The cubic root of 28971541 is about 307.1311496014.

The spelling of 28971541 in words is "twenty-eight million, nine hundred seventy-one thousand, five hundred forty-one".