28355161 has 2 divisors, whose sum is σ = 28355162. Its totient is φ = 28355160.

The previous prime is 28355143. The next prime is 28355213. The reversal of 28355161 is 16155382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 855625 = 5244^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 28355161 - 2⁹ = 28354649 is a prime.

It is not a weakly prime, because it can be changed into another prime (28355461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14177580 + 14177581.

It is an arithmetic number, because the mean of its divisors is an integer number (14177581).

Almost surely, 2^28355161 is an apocalyptic number.

It is an amenable number.

28355161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28355161 is an equidigital number, since it uses as much as digits as its factorization.

28355161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 28355161 is about 5324.9564317466. The cubic root of 28355161 is about 304.9374089962.

The spelling of 28355161 in words is "twenty-eight million, three hundred fifty-five thousand, one hundred sixty-one".