28911241 has 4 divisors (see below), whose sum is σ = 29078532. Its totient is φ = 28743952.

The previous prime is 28911199. The next prime is 28911263. The reversal of 28911241 is 14211982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14211982 = 2 ⋅7105991.

It can be written as a sum of positive squares in 2 ways, for example, as 24049216 + 4862025 = 4904^2 + 2205^2 .

It is a cyclic number.

It is not a de Polignac number, because 28911241 - 2²¹ = 26814089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28911041) 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, 83386 + ... + 83731.

It is an arithmetic number, because the mean of its divisors is an integer number (7269633).

Almost surely, 2^28911241 is an apocalyptic number.

It is an amenable number.

28911241 is a deficient number, since it is larger than the sum of its proper divisors (167291).

28911241 is a wasteful number, since it uses less digits than its factorization.

28911241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167290.

The product of its digits is 1152, while the sum is 28.

The square root of 28911241 is about 5376.9174254400. The cubic root of 28911241 is about 306.9179188302.

The spelling of 28911241 in words is "twenty-eight million, nine hundred eleven thousand, two hundred forty-one".