28971601 has 2 divisors, whose sum is σ = 28971602. Its totient is φ = 28971600.

The previous prime is 28971541. The next prime is 28971611. The reversal of 28971601 is 10617982.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28901376 + 70225 = 5376^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 28971601 - 2¹¹ = 28969553 is a prime.

It is not a weakly prime, because it can be changed into another prime (28971611) 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, 14485800 + 14485801.

It is an arithmetic number, because the mean of its divisors is an integer number (14485801).

Almost surely, 2^28971601 is an apocalyptic number.

It is an amenable number.

28971601 is a deficient number, since it is larger than the sum of its proper divisors (1).

28971601 is an equidigital number, since it uses as much as digits as its factorization.

28971601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 28971601 is about 5382.5273803298. The cubic root of 28971601 is about 307.1313616239.

The spelling of 28971601 in words is "twenty-eight million, nine hundred seventy-one thousand, six hundred one".