28151161 has 4 divisors (see below), whose sum is σ = 28165732. Its totient is φ = 28136592.

The previous prime is 28151159. The next prime is 28151177. The reversal of 28151161 is 16115182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16115182 = 2 ⋅8057591.

It can be written as a sum of positive squares in 2 ways, for example, as 4928400 + 23222761 = 2220^2 + 4819^2 .

It is a cyclic number.

It is not a de Polignac number, because 28151161 - 2¹ = 28151159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28151861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3846 + ... + 8431.

It is an arithmetic number, because the mean of its divisors is an integer number (7041433).

Almost surely, 2^28151161 is an apocalyptic number.

It is an amenable number.

28151161 is a deficient number, since it is larger than the sum of its proper divisors (14571).

28151161 is a wasteful number, since it uses less digits than its factorization.

28151161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14570.

The product of its digits is 480, while the sum is 25.

The square root of 28151161 is about 5305.7667683380. The cubic root of 28151161 is about 304.2043618094.

The spelling of 28151161 in words is "twenty-eight million, one hundred fifty-one thousand, one hundred sixty-one".